Luna decided to move to Tokyo for a summer class at a prep school and live alone in a private lodging. However, when I arrived at the site, a large amount of garbage was scattered in front of the door of my neighbor. A dirty room with a pile of garbage ... Shimonuma, a dirty brother (Onii) who heard Luna say something about the smell of garbage, turned upside down and abducted Luna. Luna's delicate body that resists can not match the power of her dirty brother who trained with continuous ejaculation masturbation, and her mind and body are dominated by her abnormal habit.