Hisako Mannen and Mayuko Hachiya are a pair of sophomores at Seison Girls' High School, known as Chako and Mako, who break school rules by wearing long tight skirts. The story of their naive and radical youth unfolds with the participation of nearby high school students. It is 1974 - Chako and Mako are a pair of mischievous but naive in love at a girls' high school in the mountains. Their youth runs through the story!