Natsume Takumi is a talented architect who runs a design bureau in Tokyo. He is smart, handsome, successful and popular with women. Takumi lives alone in an elite apartment in a multi-storey building. One day, for the first time in many years, he meets his childhood friend Sendo Yae and makes her an unusual proposal...

Sendo Yae is single, works in a cafe and shares an apartment with a friend. One day she loses everything: she gets fired from work, the guy quits and, on top of everything else, her friend announces that she is getting married and moving out of the apartment. Unable to pay rent alone, left alone and without a job, Yae finds herself in a desperate situation.

At this time, she accidentally meets Takumi, and he offers her for the next six months to get a job with him as a "fictitious wife" with accommodation in his apartment. Takumi, for her own reasons, needs the status of a married man, and Yae, left on the street and without means of livelihood, is forced to agree to the proposal.