Working in a university office, Yuki falls head over heels for the innocent and earnest student, Iku, at first sight. When she accepts his invitation to dinner, his pure reactions make Yuki's heart race, prompting him to blurt out, "Let's go out!" Though Iku is taken aback by the sudden confession, she gradually finds her heart swayed by Yuki's passionate advances. Then one day, Yuki ends up spending the night at Iku's place—what will happen as their relationship takes an even deeper turn...?!