This is the story of a boy named Tenshi who learns that he isn't human and all the adventures he has because of that fact. It all happens after he meets Orian who reveals Tenshi's real form and his Mom, Lani, tells him he was adopted. After a period of time they leave Earth through the portals and end up on Tengoku where Orian lives with quite a few people. Of course none of them human either! Tenshi then starts reserching, to find out about his past with the help of Orian. This is diffucult since Tenshi can't remember anything before being adopted at the age of 8. As the story goes on we will meet more characters and the story might get more darker as Tenshi's past is revealed.