The main character of the story is Hanafusa Yotaro, a member of the last order of knights in the 21st century called "Knights of Peace." One day he meets a girl named Kidoin Makiō, and upon learning that she is an "orphan" (living entirely alone), he takes her under his guardianship and begins to look after her. Because this girl is not entirely ordinary, she is the sole heir of the world"s largest corporation, Kidoin Group.