Babanba Banban Vampire - S01

A decade ago, Ranmaru Mori, a 450-year-old vampire, was saved from the brink of death by Rihito Tatsuno, a young and innocent boy. Since then, Ranmaru has worked at the Tatsuno family bathhouse with a secret: he wants a taste of Rihito's virgin blood the moment he turns 18. But his plan is threatened when Rihito falls in love with a girl on his first day of high school. Jealous and afraid that Rihito's purity will be ruined, Ranmaru starts lurking in the shadows to protect him from any harm. Along the way, the vampire has to keep his true identity hidden and make sure his target's virginity stays untouched.