Kyosuke never liked his step-mom and wants her out of the house after his dad died. Megumi proposes that Kyosuke can do anything he wants with her daughter, Yuna, if he allows them to stay. He allows them to stay.
Demons are attacking earth, releasing a field that drives men to lust after anything female. Angels Yuuri and Suzune decide to fight these creatures of darkness and save the world. Though, maybe the men don't want to be saved...