Haruhiko Usami 宇佐見春彦

Haruhiko is 30 years old. he is Akihiko's older, half-brother (they have different mothers). He does not appear in the anime in the first season at all. He is generally cold and disapproving towards his brother, if he doesn't dispise him deeply. They might hate each others and seem like night and day but the story will tell us that they actually very similar personailty wise.