After receiving a bizarre chance to go back in time, a man wakes up to find that his whole life — including the person he married — is different.

Kenzaki Motoharu has been married for five years. Throughout these five years, he has been receiving stress from his boss and wife, Mio. Motoharu begin to wonder why he ended up marrying with Mio. While showing dissatisfaction and regret with his married life, he suddenly slipped back in time and witnessed his wife getting replaced.