Yuki, a beautiful older woman who moved in next door, is a single mother.Asano was worried about her, who had just gotten divorced and seemed to be having a hard time.One day, Asano, who wanted to help her but couldn't muster up the courage to help her, witnessed an argument between Yuki and her ex-husband.He immediately gets in the way of his ex-husband's sword attack, which looks like he's about to attack her, but he ends up getting beaten up instead.His self-centered actions hit Yuki in the chest, and the sense of distance between the two deepens.Their relationship develops from just neighbors to an irreplaceable one.