A guardian of integrity that does not tolerate any mistakes. He is always keeping an eye on his mates Rikai is a neurotic person with an extremely rigid personality. When he sees residents of the sharehouse not following the rules, he will blow his whistle at them and nag them. He is very strict, but all his actions are with the good intentions of keeping his housemates happy, healthy, and safe. He is responsible and clearly cares about them all, even with his strict and overbearing personality.