Karada Iokawa wanted to be an adult, but a wish made upon a mystical stone went wrong. Instead of reaching maturity, she aged prematurely while her best friend, Shoko Nogami, was suddenly regressed into a teenager. Shoko, who had already lived a full life of global experience, now finds herself sitting in a junior high school classroom alongside Karada. The two friends must manage their shifting social lives and evolving romantic interests while adjusting to their swapped physical ages.
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