第1話: 未来の自分からの手紙を受け取った南戸は、転校生の成瀬カケルに関する警告を知る

It's the spring of Naho's second year in high school, and Naho receives a letter from herself, 10 years in the future. The letter accurately depicts what's about to happen, including details on a transfer student from Tokyo, Kakeru Naruse, who ends up sitting beside her in class. On top of that, the letter also begs Naho not to invite Kakeru out with her group of friends on that day alone, but why? (Source: Crunchyroll)

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