細川行成

Yukinari grew up in a strict, old-fashioned family that maintains influence and power in both local and national government. There's a certain amount of privilege coming from that background, but mostly Yukinari feels a burden of restrictions, keeping-face, and achieving academically. Yukinari is easily distracted, tends to dream, and is not very self-conscious. He loves the ocean and sailing. A bit masochistic, he enjoys annoying the people he likes until they snap at him. He is physically sensitive, so he doesn't like to be touched randomly. Masaharu's classmate and later, Natsume's dorm roommate.