The story follows adult badminton club members enduring sexual harassment from their coach under the guise of training, all while seriously dedicating themselves to practice. It's not just sweat flying across the court—attention is drawn to the players' cleavage as well. Under the pretense of coaching, the coach's fingers stray to intimate areas, which the members endure by telling themselves, "This is part of training." However, the coach's true intention is revealed to be his lustful desire for their healthy, athletic bodies. From forced blowjobs in the restroom to titty fucks in the shower room, the cruel coaches indulge their desires through the players' physical submission. Meanwhile, some club members provoke the coach and take pleasure in dominant female (namasugi) antics. The hidden reality of an adult sports club unfolds inside the gymnasium, exposing a shocking truth.