Just as the group begins searching for sapphire on foot, Ruri uncovers a grave mistake that halts their plans.
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1. Perfect!
2. Finally...
3. The time is... here!
4. There's no sapphire to be found!
5. G-Left
6. G-Right
7. F-Left
8. F-Right
9. Up until now, we've traced the sapphire
upstream while climbing the mountains.
10. F-Right
11. F-Left
12. G-Right
13. This way
14. At Branch F, there was
only sapphire on the left side.
15. G-Left
16. But at Branch G, there wasn't
any sapphire on either side.
17. None on either side
18. There's no sapphire at Branch G or beyond.
19. Ikazuchi
20. G-Left
21. G-Right
22. F-Left
23. F-Right
24. Which can only mean...
25. The sapphire deposit can only
be somewhere in this area!
26. Wow, great job narrowing this down.
27. A Closer Look into the Blue
28. A Closer Look into the Blue
29. And you kept records every step of the way.
30. Your hard work definitely shows.
31. Our next step is to search on foot.
32. You mean it?
33. Yup. We're ready.
34. Your work speaks for itself.
35. We'll search as a team now.
36. A legend about dragons?
37. You haven't heard of it?
38. Ryuketsu City is famous for its
dragon node, a concept from feng shui.
39. Welcome to
Ryuketsu City
40. You mean a hole where dragons lived?
41. Yup. There's also Ryuogafuchi, where
dragons lived, and the Ryuchin Waterfall.
42. The entire city is full of
legends about dragons.
43. Wow...
44. A city where dragons lived, huh?
45. Sounds cool.
46. Wait, aren't we heading to the mountains?
47. We're making a quick stop.
48. We need to pay a visit to the shrine
so we'll find sapphire.
49. Seiryuji Shrine
50. What are you reading?
51. The history of this shrine.
52. The Seiryuji Shrine was built
in the 7th year of the Tenpo era...
53. Uhh... blah, blah.
54. Want a quick summary?
55. During a long drought, people began
invading the mountains to pray for rain.
56. And in Tenpo 7, the dragons
finally unleashed their wrath.
57. Storms ravaged the area for days and days,
58. causing landslides that
left the town in shambles.
59. That was when a young dragon
appeared before the villagers.
60. "Should you wish to calm the wrath
of our brood of dragons,
61. use my powers as the Seiryu dragon."
62. "But you must swear to worship my spirit
as your deity until the end of time."
63. The young dragon vowed to save the people,
64. then disappeared into
the spine of the mountain.
65. The very next second,
a blade of lightning struck,
66. and the storms cleared instantly.
67. When a villager later entered the mountains,
68. they found the remains of the young dragon.
69. What an inspiring story.
70. Apparently, its remains
are enshrined in this temple.
71. Dragons actually existed?
72. Nah, it probably belonged
to a bear or something.
73. Nagi-san, you ruined the story.
74. Ikazuchi
75. Now, should we head left or right?
76. It'd be nice if there were a clue to help us.
77. It's mudstone.
78. We won't find any sapphires on this side.
79. Mudstone means no sapphire?
80. Right.
81. Magma
82. Sapphire forms as magma cools
and solidifies underground.
83. But mudstone is a sedimentary
rock that forms when
84. mud is pressed together
at the bottom of water.
85. Their origins are completely different.
86. Big crystals that can be gems
are found in igneous rocks,
87. which form when magma cools.
88. So the right side's out.
89. Let's look on the left side of the map.
90. Out
91. Senpai... Can we take a break...?
92. Let's rest after we climb up here.
93. Imari-san, just a bit more.
94. Thanks...
95. I'm more of a homebody, you know...
96. What the—
97. What's wrong, Senpa—
98. A cliff?
99. Hang on, the map didn't show any cliffs.
100. Did they forget?
101. No, it's likely because it's too small.
102. Rock Cliff
103. Soil Cliff
104. For maps to include cliff signs,
105. they have to be over 3 meters tall
and 75 meters wide.
106. I'm guessing this one isn't wide enough.
107. Topographic maps can't include everything.
108. Darn, what a bummer.
109. I guess we can take a detour that way—
110. Not so fast. We're searching
for the sapphire deposit, remember?
111. We can't leave without studying this cliff.
112. Oh yeah.
113. It's too far away. I can't get a good look.
114. Can't we skip this place for now?
115. There are other places we need to look.
116. But what if we miss something here?
117. It'll be fine!
118. There's no way we'd miss sapphires.
119. Nuh-uh. All we know is that
there's a sapphire deposit somewhere.
120. We have no idea how big it is.
121. It may be so small that we could easily miss it.
122. You'd be surprised at how hard it is
to go back and search again.
123. Nothing's as scary as assuming
you're done researching.
124. Imari had a similar scare recently
with her fluorite research.
125. You were talking about yourself?
126. By the way, Senpai! Find anything up there?
127. There's another cliff like this one.
128. We may not be able to climb our way around.
129. I'd like to study the rocks down here, but...
130. This bed of fallen leaves is a problem.
131. It's hard to study rocks
when they're covered like this.
132. Seems to be the case
for this entire mountain.
133. This is starting to look
like it could take forever.
134. Wh-What if we studied sand?
135. G-Left
136. G-Right
137. F-Left
138. F-Right
139. If we can narrow down the deposit's mountain,
140. Good Chances
141. Good Chances
142. Better Chances
143. Good Chances
144. Sapphire
145. No Sapphire
146. we can narrow down where too, right?
147. Could
be
here!
148. You're right.
149. Blindly searching the mountains
on foot won't help us.
150. Let's go with Ruri's idea.
151. Yeah!
152. All set to go!
153. Whatcha looking at?
154. Tourism pamphlets I got at
the shrine in Ryuketsu City today.
155. There was something that caught my eye.
156. What's that?
157. We've got the Ryuketsu Shrine,
Ryuchin Waterfall, and Ryuogafuchi.
158. Ryuketsu Shrine
159. Tourism Guidebook of Ryuketsu City
Ryuchin Waterfall
160. Ryuogafuchi
161. But the shrine we visited today
is named Seiryuji Shrine.
162. Established in Tempo 7
Seiryuji Shrine
Seiryuji Shrine and Ryuketsu City Tourism Dept.
163. This one includes the kanji for "blue."
164. Is "seiryu" a rare name or something?
165. No, I guess it's actually pretty common.
166. Just an idea.
167. What if we cut this sand down to half?
168. We can't do that.
169. The conditions have to be
the same as your other samples.
170. What if we cut down the amount
and don't find any sapphires?
171. We'll wonder if the sample size was to blame.
172. Reliable records are key
to finding the correct answer.
173. No need to rush. Let's stick to
the same conditions as before.
174. Your notes are that good.
175. Oh no, what's happening?
176. I was totally fine before,
but I feel uneasy all of a sudden.
177. Are my notes really reliable?
178. Did I record everything correctly?
179. But Nagi-san said it was okay.
180. It's too late...
181. Nothing's as scary as assuming
you're done researching.
182. O-Okay, I can check.
183. Whenever there's doubt, retrace your steps.
184. That's what records are for.
185. This part looks good.
186. This checks out, too.
187. Collection Site
F-Right
188. Nagi's Respite
189. Sapphire is a blue mineral composed of colorless, pure corundum that contains both iron and titanium as impurities. The name "sapphire" is derived from a word meaning "blue," and its Japanese terms "seigyoku" or "sogyoku" both mean "blue gem" as well.
While sapphire is strongly associated with the color blue, it actually comes in a wide range of colors such as orange, green, yellow, and pink
depending on the presence of different impurities, which all classify as sapphire.
These are typically referred to under the format of “color + sapphire,” such as green sapphire. The exception is ruby, which is when sapphire turns deep red due to the impurity of chromium.
This distinction originates from an old classification system used for gemstones. Up through the early modern period and before the development of modern mineralogy, gemstones were classified primarily by color―blue stones were called "sapphires," and red ones "rubies."
As a result, even blue lapis lazuli was once referred to as sapphire, and vivid red garnets were called rubies.
When we encounter the names "sapphire" or "ruby" in historical texts, they don't always refer to the same gemstones we associate with those names today.
190. Colorless
191. Red
192. Yellow
193. Blue
194. Color
Change
195. Purple
196. Chromium
197. Nickel,
Chromium
198. Iron,
Titanium
199. Vanadium
200. Iron,
Chromium,
Titanium
201. Changes color
depending on light exposure
(i.e., sunlight or candlelight).
202. Nagi's Respite
203. Dragon's Bone
204. I studied ten samples of sand for each
collection site and marked them down.
205. But this site only has nine marks.
206. I missed a sample somewhere.
207. I gotta find it!
208. Can't find any in my samples.
What about you, Imari?
209. None in mine, either.
210. How about yours, Ruri?
211. I'm so sorry!
212. I see what happened.
213. So you went back and looked at the old samples
and found this new sapphire.
214. And it just so happens to be from Point F.
215. G-Left
216. G-Right
217. Possible Deposit Area
218. F-Left
219. F-Right
220. Somewhere we didn't think had any sapphire.
221. So now we've found sapphire
in both river branches.
222. Found one!
223. This
way!
224. Nope!
225. This
way!
226. But how? Did the river flow backward?
227. That's hard to say.
228. Of course. I think I've got it.
229. Rocks in the mountains break down
and travel downhill.
230. So let's imagine its trajectory.
231. Deposit
232. Deposit
233. Let's say the deposit is at Point A or Point B.
234. Rocks would only end up in one branch.
235. Deposit
236. But what if it was at Point C?
237. It could end up in both.
238. In other words, the deposit
is along the mountain ridge
239. and downstream of Point G,
where we didn't find any sapphire.
240. G-Left
241. G-Right
242. F-Left
243. Somewhere along this red line.
244. That's where we'll find the sapphire deposit.
245. That's the right side
we initially counted out.
246. That was a close call.
247. But this narrows down our search site.
248. It's a huge step forward.
249. Ugh! If only I hadn't missed that sample!
We could've found it sooner...
250. Don't beat yourself up.
251. You looked back at your notes
and found the mistake yourself.
252. You did a good job.
253. See, it's thanks to your notes
that we found it at all.
254. Yeah.
255. This time I promise to find
that sapphire deposit!
256. Black stone... Black stone...
257. Never mind, another mudstone.
258. Ugh, does this deposit even exist?
259. Nagi-san! Find any?
260. Nope. All mudstones.
261. Should we keep climbing?
262. Nagi-san! Imari-san!
263. This is it.
264. Mudstone heated by magma, known as hornfels.
265. There's sapphires in here?
266. But this isn't our target.
267. Why not?
268. This boulder won't lead us
to any high-quality sapphire.
269. Clarity
270. Well-formed Crystal
271. Beautiful
Blue Color
272. That requires a special set of conditions.
273. A long cooling process and just
the right amount of impurities.
274. Long
275. Cooling Process
276. Right Amount
277. of Impurities
278. Enough Space
for Minerals
to Grow
279. Not to mention a large space where
minerals can grow substantially.
280. Etc.
281. Several to Dozens of
Kilometers Underground
282. There's only one place
that meets all those conditions.
283. Magma deep underground, at about
several to even dozens of kilometers.
284. Hornfels is a metamorphic rock
formed by contact with magma.
285. Which means...?
286. The sapphire deposit is somewhere nearby!
287. Mudstone
288. Hornfels
289. Finally!
290. Huh?
291. There's no hornfels underneath.
292. Same here. Something isn't adding up—
293. Oh! My bad.
294. This place isn't a hornfels site.
295. Oh! There's no rock underneath.
296. This boulder must have tumbled down here.
297. Jeez, you had me all excited.
298. Chin up, we might still find something.
299. Look!
300. There's sapphires in here!
301. It's really somewhere in this mountain!
302. Judging from its density,
the actual deposit must be...
303. One heck of a deposit site...
304. Well.
305. Looks like we lost sight of it.
306. What now?
307. If only we had a clue of some kind.
308. Or if these leaves weren't here.
309. I doubt we can search the entire area today.
310. Um, I dunno if this will be any help, but...
311. Here.
312. It might be here!
313. You looked through the rest
of the sand samples from the other day?
314. Hmm...
315. Of course! Look here!
316. It might be here!
317. G-Left
318. G-Right
319. F-Left
320. F-Right
321. This is the ridge of the mountain
we're searching right now.
322. And this is the area Ruri researched for us.
323. If we lay the two on top of each other...
324. Good Chances
325. Best
Chances
326. This must be it.
327. We've got our work cut out for us.
328. That tree looks like it was
knocked down by something.
329. Could it have been that boulder?
330. So the boulder tumbled down
and knocked it over.
331. There's another fallen tree over there!
332. Ruri, watch out—
333. Ruri! You okay?
334. What is this thing?
335. Is there anything underneath?
336. Let's start digging!
337. Black stone!
338. It's hornfels!
339. This must be where that boulder used to be.
340. So the deposit is here somewhere?
341. You guys ready?
342. Let's sweep this entire area!
343. Yeah! Let's do it!
344. I found it!
345. Really?
346. We finally did it.
347. I've been dying to find you!
348. There's gotta be more here.
349. Let's find 'em!
350. Incredible.
351. You were right.
352. I found some, too!
353. We should have brought brooms
instead of hammers.
354. Gotta keep digging!
355. I found this spot,
thanks to all that hard work.
356. I'm glad we found it,
but why is it here of all places?
357. This magma probably carried it here.
358. Magma did?
359. Minerals like sapphire form deep underground
over a long period of time.
360. Tectonic Movement
361. They reach the Earth's surface
as a result of tectonic movement.
362. But that likely wasn't the case
for these sapphires.
363. Earth's Surface
364. As magma rose toward the surface,
it picked up sapphires along the way,
365. Magma
366. carrying them close to the Earth's surface.
367. Remnants of Cooled Magma
368. Over the years, the surface eroded,
revealing the sapphires beneath.
369. Take a look at the parts that aren't sapphire.
370. There's not a single other crystal in sight.
371. You're right.
372. This magma must have cooled
quickly at a shallow depth.
373. It wasn't a suitable environment
for large crystals to form.
374. And yet, it contains these
sizable sapphire crystals.
375. The most logical explanation is
that they formed elsewhere.
376. These sapphires are all
thanks to this magma.
377. Nagi-san, how can you tell all this
just from a quick glance?
378. I've been watching for a long time.
379. From the depths of the Earth
to the edge of space...
380. The world of rocks is full of wonder.
381. I could never get bored of it.
382. You've been watching them
for a long time, too.
383. Me?
384. We were only able to
find this place thanks to you.
385. I'm grateful for your work.
386. Gotcha!
387. That makes three.
388. I only have three more pages to go.
389. Which one next...?
390. You can do it.
391. You're up next!
392. Nice! A huge crystal!
393. Maybe it's even bigger underground.
394. Huh? What's this?
395. Seiryuji
396. It's Seiryuji Shrine's monument!
397. You mean the shrine we parked our car at?
398. So this was where it was!
399. You know what this is?
400. I was looking over old maps for
some hints on the deposit's location.
401. Seiryuji Shrine
402. Ryuchin Waterfall
403. Turns out, Seiryuji Shrine used to
be somewhere on this mountain.
404. Ryuketsu Shrine
405. Established in Tempo 7
Seiryuji Shrine
406. Ryuchin Waterfall
407. Wait a second...
408. Could "Seiryu" be referring to sapphire?
409. What? It's gotta be a coincidence.
410. I wouldn't be too sure about that.
411. Then "Seiryu" was... a dragon of sapphires?
412. What about that offering of a dragon's bone?
413. It must be sapphire from this deposit.
414. Maybe the shrine was
transferred to its current place
415. to prevent people from ravaging the mountains!
416. So they wouldn't anger the dragons.
417. That's it!
418. Yeah, people didn't know
about this stuff in the past.
419. I only know that this isn't a dragon's bone
because I learned what sapphire looks like.
420. Seiryu's bone, huh?
421. The worldview of that time
must have made it seem that way.
422. Back then, people had no means
to scientifically explain
423. the forces of Mother Nature.
424. After the storms, this area
was revealed by landslides.
425. The only way to make sense of such phenomena
was through believing in higher powers.
426. Through the eyes of people from the past,
sapphires appeared like dragons.
427. Ruri, what do you see when you look at it?
428. Sapphire
Research Complete!
429. Done!
430. That's a wrap on sapphires.
431. Senpai, what do you think?
432. Hmm... There's too much stuff
that's not related to your thesis.
433. You don't need to incorporate
every finding into your paper.
434. I couldn't help but write about fluorite...
435. I get what you mean.
436. Just when you think you're done researching,
you'll find there's more to learn.