Niwa Ikusei, a night-to-night lodger in various girls' homes while pursuing music studies, crosses paths with Yui Mahiro, a senior in the composer's department, leading to an unexpected encounter that brings a girl to tears. Despite being the son of a renowned pianist, Ikusei finds himself in the composition department where Yui excels. Drawn to Yui's musical talent, Ikusei invites her to join his band for the upcoming cultural festival. Witnessing Yui's typically reserved demeanor shift to reveal a pure and steadfast side, Ikusei is captivated by her hidden depth and sincerity.