My father's new wife was my classmate and first love. Yuzuki Ria - Ria Yuzuki

The movie revolves around Takuya, whose father remarries his elementary school classmate and first love, Leah. This unexpected turn of events creates a complex family dynamic, especially given the significant age gap between Leah and Takuya's father. As they start living together, the story explores the tensions and relationships within this unconventional household, including the rekindling of feelings between Takuya and Leah.