Shidou Yuuma

Hobbies: Fishing
Likes: Older women, pervy jokes, his family, shaved ice
Dislikes: Every other guy except for Toshiki, people who leave their works to be finished by others, people who hate their talents

Toshiki's classmate. Although is quite narcissistic and tends to hit on women, he is also able to give serious and well-thought advice when needed. As a writer, Yuuma is the kind of person who researches what gets used in the trending bestsellers or what's popular in general, and incorporates them in his stories.
He is also Shion's twin brother. Just like his sister, he claims to be the older one.