Yahiro Utahoshi (歌星=矢尋, Utahoshi Yahiro) is a psychotic Shinigami working under Masato Nagareboshi. Yahiro prefers to fight alone without his teammates interfering, and he puts on his headphones and blocks out the outside world by listening to music, even describing himself as an "intolerable devil". Despite his brashness, Yahiro is highly intelligent; often acting as a strategist to his team. Before Chira Tendou took Yahiro in, the young man was a feared serial killer, until Chira bested him in one-on-one combat. After Gai Nagareboshi's defection to Masato's side, Yahiro immediately takes a shine to him, surprisingly. Yahiro is labelled a mad scientist, with genius compared to Mayuri Kurotsuchi or possibly exceeding his insanity and talent. Known as a prankster, Yahiro is fond of experime