Mana and Yuki, circle friends who stood each other up, become subjects in an experiment examining whether platonic relationships can evolve into romantic feelings. Mana, an art club member, initially denies any romantic interest, maintaining a shy demeanor. Her reactions are tested through a peculiar method—sketching her friend's cock. The study investigates whether drawing a cock elicits any response from her, and how it might affect her attitude toward future circle activities. Surprisingly, no reaction occurs during the sketching, but during the next experiment—dry humping—direct stimulation finally triggers a response. Mana gradually loses consciousness, culminating in a massive creampie. A dramatic and unexpected turn of events unfolds in this compelling release.