Kokoro is a twenty-eight-year-old office lady whose capable and sharp demeanor makes her junior colleagues afraid to approach her. After a painful breakup with her ex-boyfriend—for whom she had even bought an apartment—she has thoroughly given up on romance and settled into a contented solo life. One night at her regular bar, she drinks too much and, in a moment of drunken impulse, invites the young, handsome, and cocky bartender Kei to come live with her. To her shock, he takes the offer seriously and moves in the very next day. Kei is lighthearted, affectionate, and completely unrestrained, constantly disrupting Kokoro’s carefully ordered routines. She resolves never to fall for such a dangerous man, but as they share daily life—handling household mishaps, exchanging unexpected kindnesses, and slowly letting down their guards—the line between convenience and genuine emotion begins to blur. The story follows the gradual, awkward, and often humorous reshaping of Kokoro’s heart as she confronts the realization that love might not be something she can simply cancel. Set against the backdrop of modern Tokyo, the manga explores adult romance, the strange emotions that come with unexpected intimacy, and the courage it takes to trust again after being hurt.