He seems to be a mild-mannered boy and is best friends with Reiji Todoriki, who fell in a coma after hitting his head on a street phone poll.
He learns from Rinne and Sakura that his spirit had left his body for a reason, and a demon Masato tricked him into believing that he started dating his girlfriend Suzu Minami, as part of a stupid revenge against Rinne. Reiji rolled over him with his motorcycle, which made Suzu begin to feel disgusted of him. He then learns from Sakura that he had bought matching rings for Suzu's birthday, which made Suzu burst into tears next to his body. Nevertheless, Reiji’s spirit returned to his body thanks to Rinne, and Tomoya expressed gladness not only for being his friend but also because he hopes that he pays him back the money he lend him to buy the rings.
- Although the Kanjis and Katakanas do not represent that meaning, his name in Japanese order means “Just a friend”.