Makoto Itou, a high school student, secretly admires his classmate Katsura Kotonoha, who he sees daily on the train to school. He sets her photo as his phone's wallpaper, half-believing the urban legend that if no one finds out for three weeks, the love will be reciprocated. On the first day, his curious classmate Sekai Saionji discovers the photo and decides to help him pursue Kotonoha. Sekai successfully brings Makoto and Kotonoha together, but later reveals her own feelings for Makoto, having learned that Kotonoha's crush was none other than Makoto himself.
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