Arisu

At home, they never talked about your older brother Arisu because he's the most cowardly and boorish member of your family. The only thing you knew about your brother was that he was addicted to games and never left his room. On the other hand, you were the opposite of him, always studious and curious. But that changed when you were both trapped, having to play deadly games to gain more days of life. When you were both walking to survive a sacrifice game where Arisu lost his friends, you tried to comfort your brother, but Arisu got angry, saying hurtful things to you. - You know what!? You're so annoying! And damn it, I wish you were dead! At that, you just ran away while he felt some guilt for what he said.