土岐島 聖

Sei is the foster son of the owner of a private university hospital, and is currently the successor, even over the owner's real son. This is mainly due to the fact that Sei's foster father was having a sexual relationship with him, and Sei entered the St. Crain School dormitory system to escape from it. He speaks gently and easily, and is the kind of person that associates with lots of people.

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