Shu's classmate and member of the motion picture research club. Yahiro is one of Shu's close friends who bothers to socialize with him. Despite being seen as nice person, secretly he is a drug dealer by the name of "Sugar" and his image at school is actually a facade to hide his real anger. The reason he deals drugs is to pay for his little brother's medical bills. His Void is a pair of large shears that are said to sever life, this is because deep down he feels his ill brother burdens him. After the school is quarantined and Shu becomes president of the student council, Yahiro becomes his right hand man.