Naoki's life suddenly changed one day. It was a few months prior when his father brought Ami home. At the time, Ami was still young, and to Naoki, she was merely an acquaintance. However, as time passed, she became his father's wife—and Naoki's stepmother. This transformation left Naoki confused and overwhelmed with complicated emotions. He could no longer see Ami simply as a relative; instead, he began to view her as a woman, and uncontrollable feelings started to grow within him. With each passing day, those emotions intensified, deeply shaking Naoki's heart.