|Manga||Danganronpa Gaiden: Killer Killer|
Koichi is a stagehand in the crime scene of a mass murder occured in chapter 1.
Koichi has short light colored hair and big eyes with small pupils, possibly due to being in shock on the murders and being suspected as a killer. He wears a casual shirt and a towel around his neck.
Danganronpa Gaiden: Killer Killer
Chapter 1 - Murder for Murder
Koichi is the stagehand during Monk Idol's concert that was held in an abandoned temple. He was one of a suspect of the mass murder occured in the concert. The special investigators of the case, Misaki Asano and Takumi Hijirihara left Koichi and the other suspects with a big question mark flying above them during their interrogation.
|Future Foundation's 6th Division||Juzo Sakakura • Ikue Dogami • Takumi Hijirihara • Misaki Asano • Mekuru Katsuragi|
|Future Foundation||Kyosuke Munakata • Kyoko Kirigiri • Ruruka Ando • Sonosuke Izayoi • Kazuo Tengan • Makoto Naegi • Byakuya Togami • Yasuhiro Hagakure • Aoi Asahina • Toko Fukawa • Ultimate Make-up Artist|
|Serial Killers||Shuji Fujigawa • Momomichi Ito • Rei Shimizu • Eiichiro Saiyama • Ted Chikatilo • Kenji Tsuruhashi • Mimiko Tomizawa|
|Ultimate Despair||Junko Enoshima • Mukuro Ikusaba|
|Minor Characters||Yujiro Ida • Yoshihiko Hayashi • Koichi Ogawa • Osamu Yamada • Hana Niyama • Kozumitsu Inaka • Ikumi Gozo • Shinya Ikemoto • Kinari Kunugida • Kanta Tsunada • Chusuke Oyama • Sakuma Fujii|