Katsuhiko Jinnouchi

40 years old. The third son of Mansaku. He works as a rescue team member at the Ueda City Fire Department. He is often teased by his older brothers for being emotionally expressive, and during the series of incidents, he is the first to confront the unrepentant Wabisuke. He was the first among the three brothers to get married. There are depictions suggesting that he was a baseball enthusiast during his student days. In the second match, he provides support from a mobile device at Kenji's request. The three brothers have apparently been gaming for 30 years (though he hasn't been playing much recently, possibly due to work). His avatar is a Borzoi dog holding an axe in its right hand, with a tail that functions as a crane.