The story is a comedy about a noble vampire, a strong public bath heir, and his family. Luka, a vampire who is feeling tired from a hangover, takes a peek at the human world for a change, and finds humans soaking in the bath to heal themselves...! Luka decides to go to the public bath "Mangetsu no Yu" to relieve his fatigue. Meanwhile, Sakura, the eldest son and heir of Mangetsu no Yu, is suffering from a shortage of staff...?