Satou-kun to Tanaka-san: The blood highschool

Satou is a vampire who fell in love with Fumiko 70 years ago, but she refused his affection and married a human instead. Devastated, he promised to return after 70 years, when her husband would be dead, to win her over. Now in the present, he has come back. The question remains whether he will be able to capture Fumiko's heart or if another person will succeed in doing so.