Ena, a newlywed, has been married for a year to Makoto, a kind coworker with a good salary. On the surface, they appear to be living a perfectly normal, trouble-free married life. However, Ena harbors one secret dissatisfaction—she has never reached orgasm during sex with her husband. She believes the issue lies within her own body and accepts it as a personal shortcoming. One day, while working her part-time job at a supermarket, she is invited by the store manager and coworkers on a company retreat. It is during this trip that she unexpectedly experiences her first internal orgasm, setting off a chain of intense and life-changing events.