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This page is about the chapter. For other uses, see Osamu Mikumo (disambiguation).

Osamu Mikumo 9 (三雲 修⑨ Mikumo Osamu 9?) is chapter 82 of the World Trigger manga.

Short Summary[]

While internated in the hospital, Osamu flashes back to his pre-Border days and recalls Rinji's last days with him before he disappeared. Upon waking up, he finds his mother and Chika in his hospital room.

Long Summary[]

Karasawa returns to Mikado City from the meeting, and helps civilians rescue people trapped under the debris. Meanwhile, Osamu is unconscious in the ICU, while the others from Tamakoma Branch watch him. Yōtarō, crying, asks Osamu not to die, but Kizaki asserts him that Osamu would survive, according to JinKarasuma then asks Chika where Yūma is, and she explains that he was out looking for Replica with Jin. Reiji then informs them that the enemies' star is still near theirs, so they shouldn't lower their guard just yet.

During his unconsciousness, Osamu reminisces about the days he had with Rinji leading to his disappearance. Rinji managed to acquire a Trigger from an unknown party and shows it to Osamu. He explains that he and this unknown party will be examining what's beyond the Neighbor's gates. He explains that the gates were used by Neighbors to kidnap humans and return to where they came from. He also suggests it could be a portal to the Neighbors' ships, but ultimately, they were linked to somewhere. Osamu asks that if that place was destroyed, then Neighbors wouldn't attack. Rinji says that would be temporary if it happened at all.

When Osamu declares that he wanted to join him, Rinji denies, stating that it was too dangerous. However, he invites him to help with an examination on May 2. However, on that day authorities arrive at the Amatori's house. Chika visits Osamu and reveals that Rinji was missing, and it was her fault. Osamu notes that it was the first time he ever saw Chika cry. He reads a pre-recorded message Rinji sent stating that if he received that message, it meant he wouldn't return.

Osamu's mother and Chika.

After that, Osamu decided to join Border as a field agent. However, the examiner recommends that Osamu becomes an Operator or Engineer due to his particularly low Trion level. Osamu, being unable to accept that, bluntly sneaks into the forbidden zone to negotiate with Border, despite knowing it's dangerous. A Bamster then appears from a gate and tries to attack Osamu, but he is saved by Jin, who kills the Bamster in one hit before it has a chance to reach Osamu.

Osamu then wakes up in the ICU, and finds his mother waiting outside, with Chika sleeping on her shoulder.

Characters in Order of Appearance[]

Triggers in Order of Appearance[]

Promotional Video[]


  • One of the gifts Osamu receives while he was unconscious was a plushie Rilienthal, the protagonist of Ashihara's previous work Super Dog Rilienthal.


e - vManga
Volumes Chapters
1 1234567
2 8910111213141516
3 171819202122232425
4 262728293031323334
5 353637383940414243
6 444546474849505152
7 535455565758596061
8 626364656667686970
9 717273747576777879
10 808182838485868788
11 899091929394959697
12 9899100101102103104105106
13 107108109110111112113114115
14 116117118119120121122123124
15 125126127128129130131132133
16 134135136137138139140141142
17 143144145146147148149150151
18 152153154155156157158159160
19 161162163164165166167168169
20 170171172173174175176177178
21 179180181182183184185186187
22 188189190191192193194195196
23 197198199200201202203204205
Chapters not yet in tankōbon format
Chapters 43444546474849505152535455565758596061626364656667686970717273747576777879808182838485
Volumes 5678910
Episodes 22232425262728293031323334353637