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在壯大美麗的世界中，兩人擦身而過的綠份。千年難得一遇的彗星殞落即將在日本出現。住在鄉郊田舍町的女高中生宮水三葉，以及住在東京的男高中生立花瀧，近來都不斷重覆發著同樣的夢：夢見自己以異性 的身分在未曾到訪過的地方生活。醒來後，他們都失去了夢中的記憶與時間。兩人最後發現真相，不禁大叫：「我們的身分交換了!?」從未見面的二人終於見面， 命運的齒輪隨之轉動……

Once in a thousand years, a comet has appeared in Japan. Mitsuha , a female high school student who lives in a rural town, and Taki, a male high school student who lives in central Tokyo, were having the same dream : dreaming themselves in a body of the opposite sex and living in a place they have never been to. They lost "time" and the "memories" after they woke up. When they both found out the truth, they screamed out "Have we switched places?" The two peoples finally met, the fate of their lives is about to set off...