Ruisa Totsuki, a personal trainer favored by celebrities, is known for transforming clients into athletes with core strength in just a few weeks. One day, while visiting a new client's home, she finds herself in an unfamiliarly messy room. Uncertain if she'll be able to recoup her high training fees from this overweight and slovenly client, she begins instructing him on a worn futon on the floor. However, her proximity to his handsome physique ignites a fire in the man, leading to...