Shin

The boyfriend figure of the Heart world, Shin is the youngest hero. He's a high school graduate trying to get into university. He's also childhood friends with Toma and the Heroine. He enjoys playing card games and is a member of the track-and-field club.

Spoiler

His father accidentally killed a man who was under the influence of alcohol - he was bullied and avoided because of this during his childhood. Shin is trying to make a successful future for himself to stop people from comparing him with his father.