A reserved wife returns from her new company's hot-spring trip acting strangely. Her husband finds unfamiliar video files in her bag and discovers a side of her he has never seen: she wears a revealing swimsuit in the coed bath, gets tipsy with young male coworkers and spends the trip cheating with wild sex. She rolls her eyes in dazed orgasm faces, moans shamelessly and cums again and again. He feels betrayed, yet the sight of her losing control still makes him hard.