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There are far worse things than having to deal with your ex-boyfriend's little sister or your older brother's ex-girlfriend. But that's something Karada Iokawa and Shoko Nogami have to learn the hard way when a magic wishing stone inexplicably grants Karada's wish to be older—and does it by stealing the years from Shoko! Now Shoko, who's already graduated and studied overseas, is Karada's age, just about to enter junior high school. Meanwhile Karada must suddenly face the real facts about what being grown up entails. And just to make a bizarre situation even more awkward, there's the issue of how to handle their existing romantic interests!

Karada is a young girl who hates being treated like a child and who wishes to be grown up. Shoko is an aloof, unhappy young woman who has just returned from overseas. When they meet by coincidence one night at a local shrine where they both like to make wishes and both exchanged ages.