Kaoru Tsubaki

Kaoru Tsubaki

椿 薫
The Physical Education (P.E.) teacher in the cram school. Called by some students as "Ol' Sideburns", he is well known to abruptly cancel and/or leave class upon recieving a call from a woman currently identified only as 'Kitten', which is the name he calls her.

(Source: wikia)