間宮 京一

The youngest son of the Mamiya Family, Kyouichi is very similar to Marisa in personality: being both rude and temperamental. He prefers to just playing games or spending time alone rather than family affair in general. Since Mitarai's arrival, Kyouichi has been losing interest in Mikako. He may turn Mitarai into his sex slave should she fails to the trap set by his mother.