Judo club member Riku stays late every day to practice due to poor performance. One day, senior club member Satoshi suddenly appears and says, "I'll specially train with you—put this on," handing him a strange wrestling uniform. As Riku resumes practice tightly wrapped in the snug fabric, during groundwork drills their groins accidentally rub against each other, causing both to naturally become erect. As arousal builds, Satoshi asks, "Do you want to try something even better?" and begins pouring lotion over Riku's body. The slippery sensation overwhelms them, distracting from practice as excitement intensifies. Eventually, they progress to anal sex. Riku pleads, "Senpai, shove your cock deep into my ass!!" and right there, they forge a new relationship.