Daisuke, a country boy, is staying at his aunt Minami's house in Tokyo while job hunting. Always kind and caring, she has been someone Daisuke deeply respects and admires. One day, as Daisuke prepares to take a bath, he accidentally catches his aunt masturbating. Both are shocked and flustered, but Minami, overwhelmed by loneliness, draws close to Daisuke with a burning body and whispers, "I'm so lonely..." Tempting him. Unable to suppress his emotions any longer, Daisuke gives in to her advances. Their relationship begins to shift into something entirely new.