Daisuke's heart is shaken by his uncontrollable feelings for his mother, Shizuka. The emotions he has long kept hidden gradually transform into forbidden desires. Worried that confessing might destroy their family bond, he struggles with inner turmoil as moving day approaches. However, on the night before the move, he catches Shizuka secretly masturbating, looking deeply lonely. In that moment, Daisuke becomes certain—his mother shares the same longing. She needs him. And so, Daisuke resolves to cross the forbidden line.