|Manga||Danganronpa Gaiden: Killer Killer|
Osamu is the stage director of Monk Idol's concert and a suspect of the mass murder in chapter 1.
Osamu has medium length hair, tied back. He wears glasses and his eyes are never seen. He also wears a white shirt.
Danganronpa Gaiden: Killer Killer
Chapter 1 - Murder for Murder
Osamu is the stage director during Monk Idol's concert that was held in an abandoned temple. He was one of a suspect of the mass murder occurred in the concert. The special investigators of the case, Misaki Asano and Takumi Hijirihara left Osamu 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|