|Killing Game Status|
|Events Participated||The Tragedy of Hope's Peak Academy|
|Fate(s)||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|
|Japanese Voice||Yoshitaka Yamaya|
|English Voice||Vic Mignogna|
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 known victim.
Sosuke has yellow eyes and short red hair styled to resemble flames. He wears the standard Hope's Peak Uniform, with the jacket tied around his waist.
Prior to the beginning of the Killing Game, Sosuke tries to act reasonable and obey Soshun Murasame's orders. He shows a somewhat aggressive demeanor, being quick to confront Ryota over his attempt to avenge Kotomi's death; additionally, he is one of the first students to grab a weapon once Karen Kisaragi begins the killing game.
After he is forced to kill Kiriko, he is horrified and seems to feel envious rage for Taro and Tsubasa. He kills them violently, only to break down crying in remorse immediately afterwards.
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 was one of the first to grab a weapon, taking a large spear. He fled into the hallway and was pursued by Kiriko, forcing him to stab her in self-defense. As Kiriko bled out on the floor, he was horrified about what he had done, confessing that he had loved her.
Later, Sosuke killed both Taro and Tsubasa as they attempted to commit a lovers' suicide, impaling the former with his spear. Seemingly fueled by envious rage for the couple after what happened to Kiriko, he screamed at Tsubasa to shut up before driving his spear through her by hitting it with Kiriko's shovel. He began crying uncontrollably after Tsubasa expired, unaware that Karen was approaching behind him with a chainsaw. She proceeded to kill him offscreen.
Kiriko was Sosuke's friend. During the killing game, Sosuke was forced to kill Kiriko when she attacked him out of fear and despair. 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.