A student from Kisaragi Academy Senior High classroom 2-9, older brother of Yuka. He will be a leading role for almost every chapter. His role in the Chapter 1 is not as big.

Satoshi is kindhearted by nature, often willing to go the extra mile for those that he cares for. Due to this, he is shown to be on good terms with most of the people in his life. Ironically, Satoshi is also a bit of a coward, and was highly reluctant to take part in the ritual that placed him and his peers at Heavenly Host Elementary School. Although stated as such, Satoshi takes the leader position when needed in the group, one example was when he was the one to check the door of the classroom when their school went into a blackout.

A bit of a blockhead, Satoshi is blissfully unaware of the crushes multiple girls in his group of peers have for him, which never sees further development as everyone becomes more preoccupied with surviving the horrors of Heavenly Host.

Despite the grotesque environment and macabre events that occur within Heavenly Host, Satoshi somehow finds the courage inside himself to push forward for the sake and safety of those important to him, such as his younger sister Yuka.