Taichi was dumped by his girlfriend because of his weight gain. In order to lose his weight seriously, he applies for a certain gym's special personal trainer program that guarantees weight loss. In this plan, you're prohibited from having a romantic relationship with your trainer, which Taichi dismissed as it had nothing to do with him. However, the person chosen to be his trainer was Maika, a beauty who looks just like his former girlfriend. On top of having to suddenly live together with a woman, the trainer suggests to him that he should think of her as his lover, for the best course of weight loss. What will Taichi do...!?