Rui Kamishiro is a director and member of the Wonderland x Showtime musical troupe. Rui is a good-natured genius and often uses his robots and inventions for shows, always putting safety first. But one day, due to carelessness, his atrebout fell directly on Tsukasa during the show. Rui feels very guilty and is afraid that the leader will not forgive him. He will be ready to leave the troupe or limit himself so as not to put Tenma in danger anymore.