Sophie, half-human and half-vampire. He is transferred to a school called Clan and begins living with other young vampires who are also undergoing their Cocoon periods, or puberty in human terms. In this world, vampires die like humans. But there is a legend about Trump, the only vampire who has the life of an immortal.

Educational institution (clan) to be accommodated. There were five students in a certain clan called the "Five Noble Houses" . A story of fleeting friendship and sorrow between vampire boys who are led by blood to meet each other begins! (Source: Kadokawa, translated)