One day, suddenly, 25-year-old Nanasawa finds herself time-slipping back 10 years. During a training camp for the film club, Nanasawa confesses to her senior, Seto, but at Seto's suggestion, they decide to date together with her past self! Having become mutual with her admired senior, Nanasawa enjoys fun and H-filled days, but one day, she has a dream about "returning to the future"...?! A reverse age-gap × yuri comedy, final volume!!