His mother's best friend, Reo, is coming to stay for a few days. Yuichi is instantly Kokoro by her plump, voluptuous body. He can't help but be drawn to her exploding breasts, which sway as she walks. His mind is immediately filled with pink fantasies. Unable to contain his desire, Yuichi rushes to the bathroom, eager to get a glimpse of that voluptuous body. However, before he can peek into the bath, he is drawn to a pair of panties that have just been taken off in the changing room, and becomes obsessed with smelling them. Then Reo appears after a bath, and Yuichi finds himself in a desperate situation, but instead, Reo presses her breasts against him...