No matter how slack a man is, it's said that there's a fitness gym where he can achieve his ideal physique just by joining… At first glance, it's an unremarkable gym. The instructor, Reiko, uses a secret membership management method to have members rigorously undergo body transformation. Her method involves using her alluring buttocks as bait, making members wear chastity belts and only rewarding those with results with the 'prize' of ejaculation. Every day, members dream of ejaculation and relentlessly work out at the gym…
