Satou-kun to Tanaka-san: The blood highschool

Synopsis

Satou is a vampire, 70 years ago he fell in love with a girl, Fumiko, but she rejected him, choosing instead to marry a human. Heartbroken, he vowed to return in 70 years when her husband died and win her again. Now its the present and he's back. Will he succeed in winning Fumiko's heart or will someone else win his.....