Asatte no Houkou

Japanese Title: あさっての方向.

English Title: Living for the Day After Tomorrow

Russian Title: В другую сторону

Chinese Title: 後天的方向

Plot
Asatte no Hōkō follows the lives of Karada Iokawa, a young girl who is set to join junior high school after summer is over, and Shōko Nogami, a young woman who has just returned from studying abroad, who also happens to be the former girlfriend of Karada's older brother. The day Shōko returns, she is dragged by Karada to the beach with her brother and a couple of their friends since she used to know Karada's brother Hiro several years before.

After becoming irritated with Hiro for leaving her alone in the United States, she purposefully tells Karada that her ribbons are childish. This upsets her greatly because she doesn't like to be treated as a child. Later that same day, Karada is found by Shōko praying at a shrine, wishing to become older. Amazingly, Karada's wish becomes true and she instantly transforms into a young woman. Incidentally, Shōko then has her adulthood taken away from her and she reverts to about eleven years old.

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!