Rion, whose hobby is photography. One day, she accidentally takes a panty shot of Matsui, the Madonna of the class. Having the panty shot makes Rion curious about Matsui's panties, and even with other students around, she starts taking pictures of her panties and masturbating without caring. Matsui notices Rion's behavior and points out that she also took a panty shot, but from there, the two become forbidden lovers. They both get hooked on lesbianism and excite each other by kissing and touching each other's bodies on campus.
