He was the king of the demon world that had been laid off because of complaints. She was the hero that had lost her position because she failed in her crusade. Fate bound these two together, and they began a journey filled with mysteries and to pay off their debts.

The "Hana Ningyou Project" (Flower Doll Project) exists to artificially create the "perfect idol" by implanting a special flower seed inside a body. The franchise follows the growth of young men who dedicate their lives to the project.

A day off... After spending so long training, Reno has forgotten what he's supposed to do with free time. But when he sees that Hoshina is up to something, he goes on a mission to tail him with Iharu!