The protagonist, Ryuki Kirishima, started dating Cyril. He remembers a strangely nostalgic smell. He lost his memory at the moment of ejaculation, squeezing out every last drop. Ryuki excels in a soccer match. Cyril watches and calls him to the backyard to give him a reward. They experience the ultimate thrill of transgression while hearing other people's voices nearby. They get so carried away that they almost get caught by their teammates, and they flee into a flower bed where they find Chiaki, Ryuki's childhood friend. Chiaki, openly hostile towards Cyril, challenges Ryuki to a contest. The stakes: Can they complete a "school-wide nude blue ○ tour"? In broad daylight, each exposes their naked, unadorned bodies to fulfill their desires. What will be the outcome of the contest?!