A number of girls have been disappearing from high school, rumoured to have run away or worse. Urban legend has it that a being known as "Boogiepop" is out murdering girls once they reached their peak moment of beauty and he was dressed in a dark robe with a top hat. One day while Keiji Takeda is out waiting for his date he comes across...

A retainer-like device known as the "SCM" is being sold on the internet and rumours have it if you wear it and challenge another person that's also wearing to a duel, you can turn them into your slave when you win. Ohta Yuuga comes across Eia Arakawa one day after dumping her best friend. After discovering how daring and smart she is...