Tõru is a somewhat quiet and withdrawn man. He's physically weak and blunt about his thoughts, and also quite childish. Despite this, he cares for Masamune Matsuoka extremely, calling him Mattsun and saying that he was his only friend, although later on he opens up to Hotaru and Haruki. He has been shown to also be very aggressive and vicious when his friends are threatened, when he threatened to kill Midori in Episode 3.