not on your list add 4.07 ✎ my boss, my hero (マイ★ボス マイ★ヒーロー) 2006 (drama)

Sakaki 'Tornado' Makio is an aggressive and mentally slow 27 year old who can't do simple math or think about much of anything for more than 90 seconds at a time. Next in line to become his yakuza family's third boss, Makio is living the good life. That is, until his father tells him he must do something before he can ever become boss -- finally graduate from high school. Posing as a 17 year old transfer student, Makio enters St. Agnes Academy. When he unexpectedly starts making friends, becomes class leader of 3-A, and even develops a potential romance, he begins to realize that one learns much more than academics in the classroom.