Imouto Bitch ni Shiboraretai - Season 1

After attending a mixer arranged by a friend, he is taken aback to discover his sister Mina among the participants. They both conceal their familial relationship and proceed with the event. The gathering escalates when a King's game commences, issuing a series of explicit dares. These include exposing breasts and underwear, participating in a Pocky game, and demonstrating masturbation. Following an incident where she becomes covered in her brother's semen, Mina reaches her limit.