The hero is a boy who has individuality by a combination of constellation and blood type. It is a preference that the love pattern is determined by the constellation god and blood type god. The god of the star divides the person's personality into 12 kinds, and the god of blood adds four kinds of personality there, the story progresses with the character determined by the constellation, but because of its character, it becomes It is to break through Koi way with a certain character by blood type. God of Constellation and God of blood type frequently appear as guide men.
(Source: Translated from Japanese Wikipedia)