->''There are things you won't reach even with outstretched hands... There are things that will fade into the distance once you let go. People are always seeking those, and before they know it, they become lost. This is a story of such a summer for us...''

Iokawa Karada is a little girl who lives with her older sort-of brother, Hiro. Nogami Shouko is Hiro's ex-girlfriend, whom he unexpectedly left behind. When Shouko is unexpectedly reunited with Hiro, the girls come into conflict, leading to hurt feelings all around. Still upset, they both find themselves together at a small shrine housing a stone that, according to local legend, will grant wishes.

They didn't expect it to actually work. Karada is suddenly now an adult, and Shouko is a child. Suddenly nobody recognizes them, they don't have any clothes that fit (Shouko even needs new glasses), and Karada has to deal with being an adult, all while Hiro and friends are in a panic about Karada's sudden "disappearance."

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!This series provides examples of:

* TheAtoner: [[spoiler:Tetsu]].
* BaitAndSwitchCredits: Mild: the opening and ending credits focus almost entirely on child Karada, who appears almost exclusively in flashbacks after the first episode.
* BeachEpisode: And it's the first episode!
* BeCarefulWhatYouWishFor
* CassandraTruth
* CreepyTwins: Sae and Yumi in the manga.
* DiscretionShot: See {{Squick}}.
* {{Disneyfication}}
* FestivalEpisode
* FishOutOfWater: Karada as an adult.
* FountainOfYouth: Shouko.
* FreakyFridayFlip: With a twist: the characters switch ages to learn more about themselves, not to learn more about each other.
* HairColors
* {{Immortality}}: In the manga, Kikuko intends to use the wishing stones to live forever.
* IncestIsRelative: In the manga, [[spoiler:Hiro slept with Karada's mom, who happens to be his aunt]].
* IWantMyBelovedToBeHappy: [[spoiler: Tetsu]].
* MagicPants: Averted; after having their ages switched Karada and Shoukou are wearing clothes way too small/big for them respectively.
* MagicRealism: It's a perfectly normal world, except for the wishing stone.
* MeetCute
* {{Meganekko}}: Shouko.
* MineralMacGuffin: The wishing stones.
* MyGodWhatHaveIDone: [[spoiler: Tetsu]].
* NotBloodSiblings: In the manga, [[spoiler:their blood relationship is probably closer then siblings]].
* OutOfFocus: Shouko.
* OvernightAgeUp: Karada.
* ParentalAbandonment: Death, actually.
* PragmaticAdaptation
* PromotionToParent: All the way up from, in the anime [[spoiler:indirectly related total stranger]], and in the manga [[spoiler:total stranger who is probably her father]].
* RapeAsDrama: In the manga [[spoiler:Tetsu forces Karada to give him a hand job]] and clearly believes that he's doing it out of love, later on he realizes he was very ''very'' [[MyGodWhatHaveIDone wrong]] and spends the rest of the manga [[spoiler:trying to find another wishing stone]] in hopes that he'll get to see her [[IWantMyBelovedToBeHappy smile again]].
* ReallySevenHundredYearsOld: Shouko; inverted with Karada.
* StalkerWithACrush: Testu in the manga.
* StandardFemaleGrabArea: Hiro on Shoko. Justified by Shoko being a child at the time.
* SwappedRoles
* ThunderboltIron: The wishing stones.
* ThreeWishes: Subverted, in the manga a sign at the shrine says the stone grants three wishes, it actually only grants one wish.
* TwinSwitch: Sae and Yumi.
* UncannyFamilyResemblance: Faked--Shouko pretends to be her own little sister, played straight in the manga with Karada and her mother.
* UnConfession: Tetsu to Karada early in the manga.
* UndeadTaxExemption: Attempted to avoid it, but Karada's fake identity works strangely well.
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