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, they exchange ages.
Shōko returns to Japan, and soon meets Karada and Hiro. They and their friends goes to the beach. After seeing Shōko's silence in front of Hiro, Tōko asks what was wrong. Shōko responds loud and when Karada tries to solve the matter in between them, Shōko tells her that she is very small for that. Hiro buys Karada some Hair Ribbons and for suggestion she goes to Shōko. She responds again ending up that Karada is childish. Karada gets humiliated and is soon cheered up by Tetsu. When Hiro and Shōko talk in private, Shōko slaps him and runs away. As soon as the moon shines, Karada grows into an adult as Shōko grows younger into a child.
Watch Now:AmazonTetsu goes to Karada's apartment to look for her and even talks with her himself, but he doesn't recognize her. The rest of the day, they go around town together to places Karada might be and end up in a hidden place where the source of the river's water is.
Karada persuades Shōkō to come live with her and her older brother. Shōkō meets Kotomi, who tries to make her play with the kids. Meanwhile, Tetsu is being forced into staying home studying while he wants to look for Karada.
Watch Now:AmazonShōko and Karada begin adjusting to their new situation. Hiro, still looking for Karada, goes to Shōko's apartment. There, he mistakes Shōko to be her little sister, but later finds out about the age switch. Some of Shōko's past with Hiro is revealed.
Watch Now:AmazonEventually Tetsu believes that Karada was turned into an adult. As Kotomi leaves the town to see her father, she gives Shōko a piece of the wishing stone she had. It is implied that they reversed the age switch, and the last shot is of the wishing stone fading into dust.
Watch Now:AmazonEpisode Ninja is a small business run by one person.
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