Michitake has been given a second chance to win his university crush's heart after leaping back seven years through time. After turning down an invitation from the mysterious "Todai Mankai" club, he joins the same chorus circle as his crush. But the clock is ticking! If Michitake doesn't earn Hayase's love, she's fated to marry someone else from another university. Can he alter the course of his miserable life, or is he doomed to be a forever-alone part-timer?