Michiko is a first-year middle-school student in Catholic school in Yokohama, a large port town. She develops an ‘S’ relationship with a second-year high school student, Youko. Youko has a troubled past that makes her the target for some unkindness from the other girls, but is herself a beautiful, smart and accomplished young woman. She and Michiko become close over spring, into summer, in slow, relaxing days walking the harbor town or spending time together on Youko’s father’s farm. A first-year high school student, Katsuko, sets her sights on Michiko and tries, through rather unsubtle means, to separate her from Youko.

舞台は昭和初期、横浜のミッションスクール。新入生の三千子に、ふたりの上級生から手紙が届く。品よく儚げな洋子と、負けず嫌いで勝気な克子。ふたりの間で揺れ動く三千子だが―昭和12年、伝説の雑誌「少女の友」に連載された本作は一大ブームを巻き起こした。少女時代特有の愛と夢、憧れとときめきに満ち満ちた、永遠の名作。雑誌初出時の中原淳一の挿絵を全点収録。