The story is about a protagonist who was born from a demon and an angel. But the protagonist himself does not know about it, because he, loses his memory at the age of 10. He lives an ordinary life. And one day he goes to another country. On a student exchange program. There he meets a green-eyed girl with whom he falls in love. Even when he returned to his country, they never stopped talking. And the moment comes when she decides to come to him. Then it is time for the protagonist to find out who he really is.