Luna came to Tokyo to attend a summer intensive course at a preparatory school and decided to live alone in a minpaku. but when she arrived at the location, a large amount of garbage was scattered in front of her neighbor's door. a filthy room piled high with garbage... shitanuma, the dirty older brother (oni), who heard luna say the smell of the garbage out loud, flew into a rage and kidnapped luna. there was no way luna's delicate body, resisting, could match the dirty older brother's strength, trained with continuous ejaculation masturbation, and her heart and body were dominated by an abnormal sexual fetish...