|Killing Game Status|
|Events Participated||The Tragedy of Hope's Peak Academy|
|Fate||Murdered by Karen Kisaragi|
|Affiliation||• Hope's Peak Academy|
• The Student Council
|Anime||Danganronpa 3: The End of Hope's Peak Academy - Side: Despair #07|
He murdered Kiriko Nishizawa, the girl he loved, in self-defense. He then murdered the couple, Taro Kurosaki and Tsubasa Kamii, supposedly in an envious rage after what happened to Kiriko. Afterwards, he himself was murdered by Karen Kisaragi, becoming the eighth victim.
Sosuke has yellow eyes and red hair that is spiked up. He wears the standard Hope's Peak Uniform, and had his jacket tied around his waist.
During the beginning of the killing game, Sosuke tries to act reasonable and obey Soshun Murasame's orders.
After he is forced to kill Kiriko, he is horrified and seems to feel envious rage for the couple, Taro and Kamii. He kills them violently, but right afterwards breaks down crying in remorse.
Junko Enoshima gathered all of the Student Council and Izuru Kamukura in the old school building and forced them to kill each other. When Ryota Someya picked up a gun, intending to avenge Kotomi Ikuta's death, Sosuke tried to get him to put it down. Soshun Murasame ordered them to stop, and Sosuke let go, causing Ryota to stumble backward, and become impaled on a katana, wielded by Karen Kisaragi.
When the Killing Game started, Sosuke fled into the hallway and was pursued by Kiriko. He stabbed her in self-defense and was horrified about what he had done, confessing that he had loved her. He then killed both Taro and Tsubasa, supposedly feeling envious rage for the couple after what happened to Kiriko.
Sosuke broke down in tears. Karen came up behind him, wielding a chainsaw, and then proceeded to kill him offscreen.
Kiriko was Sosuke's friend. During the killing game, Sosuke was forced to kill Kiriko when she attacked him, only out of fear. Sosuke showed much remorse over killing Kiriko, asking why she made him do it and confessing he loved her. His words imply he never told her about his feelings and it's unknown how she felt about him.
Since Sosuke was the one who protested to Ryota killing Junko and Mukuro Ikusaba, it is likely they were friends and he may have even felt protective over him.
Sosuke seemed to have respect for Soshun as his leader as he listened to Soshun when he told him to stop tussling with Ryota over the gun.
- He strongly resembles Leon Kuwata in appearance.