A girl who has lived in an orphanage since she was a child has a group of lovely younger brothers and sisters, but a mysterious group threatens the lives of all the children in the orphanage and asks her to seduce a man named Atobe Keigo. She has designed so many things just to make him fall in love with her.
After all, it was she who seduced him, or he fell in love with her, or she was never moved. . . .