Aika-chan is a one-of-a-kind dirty student who doesn't take a bath, wears her underwear for a month, brushes her teeth once every three days, and has lost her sense of dirt and gives off an intense body odor. She makes a killing by having sex with an old man who likes body odor, and her boyfriend is completely at her mercy after being trained to use her body odor. This is the story of a dirty honor schoolgirl who bullies a perverted M-man!