|Family|| Shin'ichirō Minato (adoptive brother)|
Ryouya Kozuki (adoptive brother)
|Relationships|| Sora Hashiba (lover; depending the player choices)|
Matsuri Honjou (lover; depending the player choices)
Compared to most of the character, Soushi acts a lot more refined, but he will occasionally get mad (especially if children are making too much noise). In the games, there are scenes where he and Sora have sex (depending on the choices the player makes). The PS2 game and the Drama CDs show that Soushi and Matsuri could become a couple.
Soushi grew up in an orphanage with his adoptive brothers, Shin'ichirō Minato and Ryouya Kozuki. Soon Ryouya left the orhanage and it was just Shinichirou and Soushi. During visitation, Ryouya would bring along presents when Shinchirou and Soushi were just children, but Shinichirou would get annoyed, wanting to play and spend time with Nanami instead.