Miyuki(1983)

Miyuki, you are my angel. Miyuki, you are my devil.

Miyuki is a romantic comedy series following Wakamatsu Masato, a high school student living in Tokyo with his unrelated step-sister Miyuki while their father works overseas. Masato already has a girlfriend, Kajima Miyuki, a popular and gentle classmate who seems like every boy's ideal partner. But his step-sister Miyuki—cute, kind, and sensitive—has become increasingly popular among his friends and peers, creating an awkward tension in Masato's life. As the two Miyukis orbit his world, Masato finds himself caught between his existing relationship and the complicated feelings stirring at home. The series explores the messy reality of teenage romance, family bonds, and the confusion of the heart when attraction and obligation collide.