'Rion', a female college student from Kansai who shares a room with her female friend. She lacks self-confidence, is shy, and doesn't like men. But the root is lascivious and she is curious about sex. Although I try to have sex with my cousin's older brother in a delusion, I can't change myself. A classmate's men are aimed at big tits, and while being confused, they wake up to pleasure and get violently disturbed.