Konoe Souichi

Souichi transfers to Reihou Gakuen and moves into the male dorm to protect Hikami Kuon in secret as Kuon rejects having a bodyguard around her. Her mother is worried, so they assign Souichi to guard her in secret. Only a few people know that Souichi is a bodyguard.
He is childhood friends with Mibu Natsuki but does not realize it until she formally introduces herself too him.