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The film centers on Akiko Yasutomi, an 18-year-old high school student living in poverty with her mother, Hisako. Akiko grapples with her feelings for her cousin, Masato Miki, a medical student, who resides upstairs. As Masato becomes involved with Akiko's classmate, Natsuko Shigeno, Akiko finds herself feeling isolated and alone.

The narrative unfolds as Akiko navigates her complex emotions and relationships, culminating in a chance encounter with Junichi Yoda that leads her to lose her purity. This drama paints a poignant picture of adolescent struggles and the impact of socioeconomic challenges on personal connections. With a cast featuring prominent Japanese actors such as Ayako Wakao and Bontarō Miake, the film captures the essence of its era and genre.