World Trigger Wiki
World Trigger Wiki

Mitsuya Koinuma ((こい)(ぬま) (みつ)() Koinuma Mitsuya?) is a B-rank Shooter and a member of Mamiya Unit.


Koinuma is a light-skinned young man of average height and build. He has middle-part, straight sandy hair that covers his ears and reaches to his chin. Like the other members of his unit, in his trion body he wears dark pants, a lighter jacket with a high collar, and boots of the same color, as well as dark-rimmed goggles with square, protruding lenses.


Introduction Arc[]

Mamiya Unit is presumably involved in the extermination of all rads in Mikado City.[2]

B-Rank Rank Battles Arc[]

In the round one lower-tier rank battles, his unit goes against Yoshizato Unit and Tamakoma Second. They are easily taken down by Yūma after Chika destroys their hideout.[3]


Hound Storm

As a B-rank agent, Koinuma should be more skilled than a C-rank trainee. His unit's foremost tactic is a combined attack which sees the three Shooters focusing their Full Attack Hound on a single target. This technique, called Hound Storm, was extolled by Ken Satori as a very powerful attack.[4] However, the whole unit was easily defeated by the combined might of Chika and Yūma without managing to put up any form of resistance.[5]

Reference Trion Attack Defense/Support Mobility Skill Range Command Special Tactics Total
Border Briefing File[6] 5 5 5 4 4 4 3 3 33



Trigger: Hound  •  Asteroid  •  Meteor  •  Shield  •  Bagworm
Side Effect: