Kamen Rider - Season 12 Episode 42 Room 401

Mitsuru accepts both sides' offer to ally with them but ultimately chooses Hideyuki and Satoru. Shiro tells Takeshi where Satoru and Hideyuki are and tells him to kill them. Takeshi later finds out that they aren't there, until he confronts Shinji, Ren and Shuichi at the same time. Reiko questions Shuichi about the thing that attacked her last time. Ren is enraged by Shinji's decision to include Mitsuru as his comrade. Hideyuki brings Satoru to lunch with his family to teach him the moral lesson about being a hero. Satoru kills Hideyuki and shatters the Alternative Deck.