Chika, with her slightly plump tummy, joins a fitness club to lose weight but ends up forced into shockingly erotic exercises that make her grimace in surprise. Under the guise of "mat training," she's subjected to a relentless series of blowjob-themed workouts—far from ordinary push-ups, sit-ups, or back extensions. Hidden pleasures unfold between each movement, building up to a climax where she's tickled in a tiny bikini during a sensual fitness session. As her body writhes and twists, the erotic tension aimed at her reaches its peak!