Next door moves a beautiful older woman named Yuki, she's a single mother. Recently divorced, she seems quite troubled. Asano has been trying to help her out in various ways but lacks the courage to do so. One day, he happens to witness Yuki's ex-husband arguing with her. Inspired by his chivalrous instincts, he intervenes but ends up getting beaten up instead. His selfless act leaves a deep impression on Yuki, leading their relationship to evolve from mere neighbors to something irreplaceable...

隣に引っ越してきた美しい年上の女性・優希はシングルマザーだという。離婚したばかりで大変そうな彼女を浅野はなにかと気にかけていた。助けになりたくても勇気が出ず尻込みしていたある日、優希と別れた旦那が言い争っているのを目撃する浅野。今にも殴り掛かりそうな元旦那の剣幕に咄嗟に間に入るも逆にボコボコにされてしまう。その身を挺した行動が優希の胸を撃ち深まっていく二人の距離感。ただの隣人からかけがえのない関係へ発展していく…。