Sayonara, Usotsuki Apartment

Ritsu, a real estate agent, has spent years by the side of his childhood friend Tsugumi, all the while harboring feelings he's never been able to confess. One day, he helps Tsugumi, who divorced six months ago, search for a new apartment, but unexpectedly they end up living together. At the same time, Ritsu struggles with the attention of a junior colleague who clearly has feelings for him. Then, Tsugumi suggests being his "pretend boyfriend," and what starts as a simple arrangement quickly takes an unexpected turn—!?

(Source: Shodensha, translated)