綿貫 琉宇

Ruu is a shy and good-natured young boy who is scheduled to die in an accident in one month. Ruu stays home with his uncle during his divorced parents' custody battle over him, and does not attend school at first. He meets Ikaru who pretended to be a classmate of his, and stays ignorant of Ikaru's position as a Kannagi no Tori, as well as his task to take his soul. Ruu has a pet hamster named Miris, who he claims he is able to understand and speak for.