Storyline
Yukio Makise joins the Royal Family Fitness Club after seeing an opportunity to work as a fitness instructor. The club is an extravagant facility operated jointly by the Mamiya Zaibatsu and Sugimoto Pharmaceuticals, and Yukio initially expects a relatively ordinary job.
Everything changes when Marie Mamiya arrives. Known as a powerful businesswoman who effectively rules the Mamiya Group, Marie immediately takes control of the situation and unexpectedly chooses Yukio as her personal trainer, despite the many experienced and physically impressive trainers available at the club.
Marie begins putting Yukio through her own demanding training program, supposedly in pursuit of maintaining her extraordinary beauty and youthful appearance. At the same time, Yukio meets Maki Suzuka, a young woman who has also joined the club hoping to become a fitness instructor. The two quickly become friendly, but Maki soon discovers that working at the Royal Family Fitness Club may involve far more than she originally expected.
As Yukio becomes increasingly involved with Marie and the people surrounding the Mamiya Group, the seemingly glamorous world of the fitness club begins to reveal a darker side. His new position exposes him to powerful personalities, hidden intentions, and situations that are very different from the ordinary job he thought he had accepted.