Ruri meets Nagi's colleague Imari, and the three embark on a journey to find a lost mine.
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1. Maeshiba University
2. Whoa...
3. Wow! This place is huge!
4. Ruri! This way.
5. What's with this place?
6. What's this?
7. It's my paper on pyrite.
8. The Lost Planet
9. The Lost Planet
10. This is why I brought you to my university.
11. You expect me to understand this?
12. That's my name!
13. Remember when we collected pyrite together?
14. When I found that rare form of pyrite?
15. Like I thought, there weren't
any existing reports on it.
16. So I couldn't help myself.
17. B-But I didn't do anything.
18. It's a paper on the specimen you found.
19. Of course your name is on it.
20. With every new discovery, it's important to
21. record that information
and make it known to the public.
22. You never know when
personal records could get lost.
23. I'm relieved that I could publish it.
24. Nagi-san...
25. This makes me so happy!
26. I never imagined my little discovery
could be so meaningful!
27. Yeah? I'm glad to hear that.
28. You really are amazing, Nagi-san.
29. You've studied so much.
30. Scientific Analysis of Mineral Resources
31. Applied Inorganic Chemistry
32. Distribution Map of Manganese Ore Deposits in Japan
33. New
Edition
34. Mineralogy Research
35. I mean, you're a graduate student.
36. Obviously, you're way out of my league.
37. Comprehensive Study on Polychromatic Rocks
38. Revised Edition Mineralogy
39. Written by the
Institute of Ore Study
40. Chemical Survey Report
41. Chemical Prospecting Methods
42. Look at all those difficult books...
43. And collected specimens...
44. Mineral and Rock Specimen
45. Mineral and Rock Specimen
46. Mineral and Rock Specimen
47. Mineral and Rock Specimen
48. Mineral and Rock Specimen
49. Mineral and Rock Specimen
50. Mineral and Rock Specimen
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81. Mineral and Rock Specimen
82. Mineral and Rock Specimen
83. Mineral and Rock Specimen
84. Mineral and Rock Specimen
85. Mineral and
86. Mineral and
87. Mineral and
88. Mineral and
89. Mineral and
90. Mineral and
91. Mineral and
92. Mineral and
93. Mineral and
94. Mineral and
95. Research on Geology of Hot Springs
96. Part Two
97. Research on Geology of Hot Springs
98. Part One
99. And scraps of paper...?
100. And expired snacks?
101. A-Actually, it's kinda messy in here.
102. Yeah, just a bit.
103. I should probably tidy up sometime.
104. Arato-senpai!
105. Did I just hear you say, "tidy up?"
106. Phew, thanks.
107. Huh?
108. Would you happen to be Ruri-chan?
109. The girl who found that pyrite?
110. Uh, yeah... and you are?
111. Oh, I'm a senior undergrad from the
same research group as Arato-senpai.
112. My name is Imari Yoko. Nice to meet you.
113. Oh, nice to meet you, too.
114. Tending to books again?
115. I was just outside airing these out.
116. So? Are you finally willing
to do some cleaning?
117. Books deserve better
than dust and mold, you know.
118. H-Hold on, I didn't mean right this minute.
119. You know, maybe when I get the right nudge.
120. Oh boy...
121. Nagi-san! This is a crystal, right?
122. Yup, sure is.
123. It's yours, if you want.
124. Yay!
125. Might as well clean now, don't you think?
126. Umm, actually...
127. I should take Ruri home,
so maybe another time.
128. I don't mind cleaning right now!
129. If you'll let me look for treasure, that is!
130. Question!
131. So any rock on the floor is up for grabs?
132. Yup.
133. Nice!
134. All righty then!
135. Time to clean!
136. This is... just an ordinary rock.
137. How about...
138. This?
139. What the heck?
140. Look!
141. It's like, alien-shaped!
142. No way this is from Earth!
143. That's bismuth.
144. Bismoot?
145. Bismuth, a metallic element.
146. Atomic Number
147. Bismuth
148. This one's been artificially crystallized.
149. Artificial?
150. No way! Humans can't make this.
151. Fine, then let me show you.
152. You can make it?
153. Yup. All we need is this bismuth crystal.
154. This will take a while.
155. Weird, I thought it would smell more.
156. Whoa! It's starting to melt!
157. Once it's fully melted, turn off the heat.
158. And remove the oxide film from the surface.
159. After that, gently insert
a wire into the center.
160. Then allow it to cool, and voilà.
161. That's it?
162. Yup.
163. Molten bismuth cools, forming a crystal.
164. As it changes from liquid to solid,
the crystal releases latent heat.
165. Heat
166. This causes a difference in temperature.
167. Area with lower temperature
168. Area with higher temperature
169. Areas with cooler temperatures solidify faster,
170. which forms hopper crystals
with edges and hollows.
171. Hopper Crystal
172. The only trick is to remove
the crystal before it fully cools.
173. It's that simple. Anyone can do it.
174. See?
175. It's so pretty!
176. Another point is to cool it slowly.
177. Arato-senpai!
178. You haven't forgotten about
the task at hand, right?
179. You've got so many books.
180. Think so?
181. You're too nice!
182. You took that as a compliment?
183. They're all rare books out of print.
184. Why'd you want old books?
185. Did you know? Information
from the past can get lost if not preserved.
186. Not to mention, specialized books
back then had few copies.
187. That said, geological surveys
rarely get updates.
188. So compared to other fields, a lot
of old findings still hold true today.
189. Which means it's our duty
to preserve old books!
190. In other words, even dated
information holds some value.
191. Not true!
192. Information from the past is much,
much more valuable!
193. Arato-senpai, you don't get it at all.
194. Prolly trash.
195. It's an old topographic map!
196. I-I found it underneath the desk!
197. When's it from?
198. Let's see...
199. This mine is still running,
so I'm guessing early Showa Era.
200. That's when they overexploited mines
pursuing mineral self-sufficiency.
201. A rare find.
202. Hey, hey. What's so great about it?
203. What's it good for?
204. You see, it's a treasure map!
205. A map of... treasures?
206. I love that kind of stuff!
207. Tell me more!
208. Sure thing.
209. Not like that!
210. I meant a quick rundown!
211. These two maps are from different eras.
212. But look.
213. Manganese
214. Mount Yatsuka
215. The old map includes a mine symbol.
216. Mount Yatsuka
217. Compare that to the recent map.
218. Huh? This one doesn't have a symbol.
219. So what happened to it?
220. The answer lies... in this third map!
221. Mount Yatsuka
222. See? The mine was shut down.
223. Facts on the Mine Symbol
224. Operating mines are shown on maps
with the mine symbol,
225. along with its main ore, like this.
226. Iron
227. But that changes once mining ends.
228. And when the mine is demolished
or abandoned, it's wiped completely.
229. Won't that make it impossible to find?
230. It sure does.
231. But for closed mines to be displayed on maps,
232. the rule requires a landmark,
like a smokestack.
233. Once removed, it's up to our own research.
234. Newspapers
235. Literature
236. Historical
Texts
237. Word-of-Mouth
238. In the end, modern information
alone won't cut it.
239. Unless you've gathered
old records like me, that is.
240. But the mine closed, right?
241. Wouldn't it be out of minerals?
242. They'd be out of money
if they dug that long.
243. Most mines close
before they exhaust resources.
244. I bet there's some minerals still there.
245. See? I told you it was a treasure map!
246. An old mine, huh? Sounds pretty cool.
247. Wanna try finding one, Ruri?
248. Take your pick.
249. You mean it?
250. You should pick somewhere accessible.
251. Somewhere close to main roads
with preserved paths.
252. I wanna go here!
253. Mount Kita-niari
254. There?
255. Why somewhere that deep of all places?
256. Sure, it doesn't include its main ore, but—
257. It's gotta be this one!
258. The map doesn't even know
about this mystery mine!
259. It smells the most like treasure!
260. Can't say I recommend it.
261. It's best to avoid places
with uncertain information.
262. Safety is always the highest priority.
263. Yeah, but that information
can be confirmed on site.
264. As for safety, I'll make that call
when we get there.
265. And I bet we have a better chance of finding
cool minerals where there's less people!
266. Who knows if that's true?
267. We could be completely off the mark.
268. It'll be fine.
269. I don't know what'll be there,
270. but there's gotta be something, right?
271. I mean, sure, but...
272. You should come with us, Imari.
273. You've hardly been out to collect ore at all.
274. Really?
275. I'm totally happy studying books, though.
276. It's not bad being the author for a change.
277. Hard to say no when you put it like that.
278. What are we waiting for? Let's go!
279. If that's the case, we'll have to prepare.
280. Let me look over next week's plans.
281. We'll need all the time we can
get to research beforehand.
282. We need to plan a schedule,
look over bear occurrences,
283. check records on past incidents,
and get survival gear just in case.
284. Yup! Six months should give
us plenty of time to prep!
285. Huh?
286. Nagi's Respite
287. Puzzle Ring:
One thing led to another, and
every researcher in the lab took
them up. An important tool
for breaks.
288. It may look like a randomly
stacked pile, but rest
assured, its owner knows
exactly where each book
belongs.
289. All-purpose wipes.
An essential item for
researchers.
290. Emergency food supply
for when you can't leave
the desk. "Best before"
isn't the same as
"expires on," so it's fine.
291. They're kept on
purpose. You never
know when you'll
need them.
292. It's more efficient to
keep what's used
most often the
closest.
293. Some might say it's a trap
to trip people, but really,
it's just making the best
use of open space.
294. Nagi's Respite
295. Some minerals emit light when exposed to UV rays. This phenomenon was first discovered in fluorite, hence the name "fluorescence" after the mineral. But that's not the only type of luminescence that occurs in fluorite.
It also glows when you heat it, which is called thermoluminescence.
To safely observe thermoluminescence, put some fluorite
in a test tube and gently heat it with a flame.
Make sure you're in a dark room so you can see it glow.
As the fluorite heats up, you'll hear cracking sounds
and observe a blue-white light. Just keep in mind, this glowing effect will only occur once after heating.
Some fluorite is fairly affordable, and you can usually find it at gemstone shops. I recommend picking some up and giving it a try.
296. It's glowing!
297. It's not here.
298. There's no mine in sight.
299. But this is where the mine
symbol points to, right?
300. Mount
Kita-niari
301. Mount
Takanishi
302. Mount
Kita-niari
303. Mount
Kita-niari
304. Mount
Kita-niari
305. Mount
Kita-niari
306. It's gotta be here then.
307. That's not much to go on.
308. This ore has a different expression.
309. Expression?
310. Imari-san, what kind of rock is this?
311. Let me see.
312. This ore is...
313. Um, I don't know.
314. They're a bit heavy.
315. I'm guessing they contain...
316. It stuck together! What's that?
317. Just an ordinary magnet.
318. This ore must contain
a good amount of magnetite.
319. Magnetite?
320. A notable type of iron ore.
321. Iron
322. Iron
323. Iron
324. Iron
325. Iron
326. Iron
327. Iron
328. Iron
329. Iron
330. Iron
331. Iron
332. Iron
333. Iron
334. Iron
335. Iron
336. Iron
337. Iron
338. Iron
339. Iron
340. Iron
341. Iron
342. Iron
343. Iron
344. Iron
345. Iron
346. Iron
347. Iron
348. Iron
349. Iron
350. Iron
351. Iron
352. Iron
353. Iron
354. Iron
355. Iron
356. Iron
357. Iron
358. Iron
359. Iron
360. Iron
361. Iron
362. Iron
363. Iron
364. Iron
365. Iron
366. Iron
367. Iron
368. Iron
369. Iron
370. Iron
371. Iron
372. Iron
373. Iron
374. You know iron sand?
That's just crushed magnetite!
375. They're pretty common, with black octahedral
crystals that have a metallic luster.
376. Where was all that information a second ago?
377. It's not rare for minerals
to look different in real life.
378. I get stumped all the time, too.
379. So our target turned out to be an iron mine?
380. All we can get are magnetic rocks.
381. I wish the map just said that.
382. W-Well I think this is a pretty cool ore.
383. Iron mine or not, that doesn't mean
iron is the only thing we'll find.
384. Who knows? You might find a stone you like.
385. If you ask me, this magnetite
should lead us to the old mine.
386. You mean up this slope?
387. We came all this way.
388. Might as well find the old mine.
389. Looks like this is it.
390. This was once the backbone
of Japan's industrial sector.
391. Although it's pretty much returned to nature.
392. Wow! This is an old mine ruin?
393. This must be it.
394. They weren't supposed to leave
the entrance open like this.
395. Huh? Wait a second.
396. Mount Kita-niari
397. Isn't this super far from the mine symbol?
398. Mount Kita-niari
399. That map was way off!
400. Not exactly.
401. Facts on Mines
402. Mine Property
403. Take a proper shape like this.
404. Where would you place a mine symbol?
405. In the center!
406. Right.
407. Now what if things were located like this?
408. Warehouse
409. Entrance B
410. Office
411. Entrance A
412. A map can only include so much.
413. You'd be surprised at what information
you can only find on site.
414. Makes sense.
415. Hey!
416. Get out of there, it's dangerous.
417. But we're exploring the mine, right?
418. What good is it if we don't go inside?
419. We can search the tailings.
420. Tailings?
421. Mines usually leave behind extracted
rocks with little industrial value.
422. In other words, even pretty rocks get discarded
if they're not worth much economically.
423. The tailings are our best shot.
424. Okay! Got it!
425. Let's search here today!
426. Where's my crystal?
427. Is it this one?
428. What about this one?
429. Or maybe this one!
430. How about this one?
431. You've got so much energy, Ruri-chan.
432. Imari-san!
433. What's this stone?
434. Huh?
435. Imari-san?
436. Hey!
437. Imari-san...
438. Imari-san, you okay?
439. I'm not sure.
440. Are we inside the mine?
441. This portion of the roof must have caved in.
442. Imari-san, is this a crystal?
443. Can't tell.
444. Are you sure you study mineralogy?
445. Meh, doesn't have a great shape though.
446. Never mind.
447. Hey!
448. Anyone there?
449. Thought I heard something.
450. Arato-senpai! Over here!
451. Where's that?
452. Look down! We fell in a hole!
453. A hole? I don't see anything.
454. We're down here!
455. Oh, there you are.
456. It's too weathered to climb.
457. I doubt we can get out this way.
458. What?
459. That path should take us to the exit.
460. Shouldn't be too far from here.
461. We could use your headlight.
462. Sure!
463. Watch your head, you two!
464. Ow!
465. You okay?
466. Darn you! It's the same crystal
as the other one!
467. Could this be...
468. Ruri, can you turn off your light?
469. Yeah, why?
470. It's glowing purple!
471. Wait, what?
472. Whoa! What's going on?
473. Is this some kind of magic?
474. This is a blacklight.
475. It emits UV light.
476. Some minerals can be distinguished with this.
477. Yup, this is likely fluorite.
478. It's so pretty.
479. What about these rocks?
480. They're not glowing.
481. Just normal rocks.
482. Fluorite glows because it contains special
impurities, like rare earth elements.
483. So it's not the fluorite that's glowing?
484. Nope, that's just the impurities.
485. It absorbs energy from UV radiation,
which is re-emitted as visible light.
486. UV Rays
487. Light
488. Light
489. Heat
490. Heat
491. Light
492. That's what makes it special.
493. Phenomenon known as "fluorescence"
494. Ultraviolet Rays
(Invisible)
495. Violet
496. Blue
497. Green
498. Yellow
499. Orange
500. Red
501. Infrared Rays
(Invisible)
502. Large
503. Small
504. The amount of energy
determines fluorescent color.
505. Energy
506. Fluorite emits violet light
as a result of the energy lost
507. UV Energy
508. Ultraviolet Rays
(Invisible)
509. Violet
510. Blue
511. Green
512. Yellow
513. Orange
514. Red
515. Infrared Rays
(Invisible)
516. UV Energy
517. Heat
518. UV Energy
519. Equivalent
Total Energy
520. when impurities re-emit
energy as heat.
521. Wow... I wish I could take it home.
522. Wait. That rock I threw away...
523. Never mind.
524. Good thing I brought this.
525. Whoa! Wait, what's wrong?
526. Hey, Ruri-chan!
527. Lemme go!
528. I gotta get my fluorite!
529. Ow...
530. Is this all fluorite?
531. The ore vein was thriving all along.
532. This is awesome.
533. It's like we're in space!
534. Yeah, it's amazing.
535. You think anyone knows about this place?
536. I've never heard about it.
537. Then it's our discovery!
538. Might be.
539. "Female high school explorer
discovers lost planet!"
540. Sounds about right!
541. Imari-san, you're not impressed?
542. Imari-san?
543. Huh?
544. Oh! No, it's not that!
545. I just wasn't expecting this.
546. I guess I'm just lost for words.
547. Like, it's just too much.
548. I mean, not too much.
549. Nagi-san, can you translate?
550. It means Imari is experiencing something new.
551. We've got our specimen.
552. And we were able to locate the mine.
553. Now we can shed light on
what was about to fade away.
554. That fluorite ore vein really was incredible.
555. We'll need to research that spot some more.
556. Arato-senpai!
557. U-Um... I don't know
if I can be of much help, but...
558. Can I help you research that fluorite ore vein?
559. Sure. I'll leave this one to you.
560. Leave it? To me?
561. B-But I'm fine just helping.
562. Its beauty wasn't enough to satisfy you, right?
563. I can tell you want to learn more.
564. You want to be part of the
knowledge that comes next.
565. It's good that you feel that way.
566. If that's the case, don't settle for
being someone's hands and feet.
567. You can't borrow the lens of others forever.
568. Can you, Imari?
569. I-I want to lead the research of this mine!
570. Great. You got it.
571. Then we'll need to gather
some more fluorite specimens.
572. Okay, let's come back next week—
573. Want 'em?
574. When did you grab those?
575. I stuffed as many as I could into my pockets.
576. Imari-san.
577. These are for your research.
578. Thanks, Ruri-chan.
579. I'll do my best!
580. Nagi-san, I wanna find stuff
with my own eyes, too.
581. Don't you know any other places like today?
582. Somewhere no one else knows
about with pretty stones.
583. I'll be the one to discover it.
584. How can somewhere be unknown,
but its stones are?
585. Want to give it a shot?
586. There's a specimen I have on hand.
587. I have a rough idea of its region, too.
588. And I've figured out how to
pinpoint its exact location.
589. But the locality of the mineral
itself is still unknown.