Leon lives a double-life of being a baker's son by day and an assassin by night. But one day, he is chosen by a dragon and must become a Dragon Master.

He attends the Dragon Academy and acquires a dragon called Shalazard.

"Once I graduate, I'll start a bakery on the frontier and live quietly."

But as if to crush his dreams, the Moon Beasts fall and information of the land of plenty(paradise) keep Leon very busy.

Will Leon ever be able to live quietly and in secret? Of course, not… Oh, here comes someone now…