Usokon

Yae is an unremarkable girl who temps for a living. She loses her home and job in one stroke and is, at 29, at her wits' end. Then her childhood friend Takumi appears before her. A good-looking, successful architect, he lives a glamorous life. In exchange for free accommodation in his skyscraper condo in the heart of Tokyo, Yae acts as his fake wife?! This is the story of a fake marriage to a smug, handsome architect!

(Source: Kodansha USA)