Yorihiko Jinnouchi

45 years old. The eldest son of Mansaku. He works at the Matsumoto City Fire Department and serves as a paramedic on an ambulance. Despite being in mourning, he grumbles about feeling guilty for taking time off due to the nature of his job. During the second confrontation, he provides support from a mobile device at Kenji's request. It seems the three brothers have been gaming for 30 years (though he hasn't been playing much recently, possibly due to work). His avatar is a bulldog equipped with a stethoscope.