Subject: Physical Education (P.E.)
Judo club advisor.

Daimon-sensei is a tall and physically imposing teacher. He is even taller than Takatoshi, who is noted to be quite tall already. He is physically in great shape and fully qualified to teach the Judo Club members. He has a thick brown beard (but no moustache) and sideburns that connect to his hair at the back of his head. The top of his head is bald (something that he worries about).

Daimon-sensei gives off an aura of being gruff and strict, enough to ensure Naruko Yokoshima behaved herself on a school trip. He also has a softer side that shows when he is with his fiancee Michishita-sensei. He also worries about his receding hairline, to the point he nervously asks Michishita-sensei if his (balding) head isn't too shiny.

He becomes embarrassed when this softer side of him is discovered, and tries to hide it behind bluster. He is also a bit forgetful, as he once forgot to warn Mutsumi Mitsuba that someone was coming to interview her and take pictures of the Judo Club.

(source: Seitokai Yakuindomo Wiki)