When 28-year-old office worker Yui Natsume expects a proposal from her boyfriend on their second anniversary, her dream is crushed as he returns his apartment key and breaks up with her. Wishing to leave the heartbreak behind her, Yui decides to move into a shared house. Initially believing the other tenants to all be women, she is shocked to meet a 19-year-old boy, Mugi Uehara, at the front door. Despite the initial awkwardness, Yui finds herself at peace in her new home. One day, when Yui is invited to a concert by a popular band, she discovers Mugi is the support guitarist for the group. After the show, she learns about the band members' resentment toward one another. As Yui and Mugi confide in each other, they gradually grow closer despite their age gap. [Written by MAL Rewrite]