During the summer break of their senior year in high school, they meet a transfer student named Kakeru Okikura, who claims that a voice from the future talks to him, and that it has led him to Tōko.
Selama liburan musim panas tahun senior mereka di sekolah tinggi, mereka bertemu seorang pelajar transfer bernama Kakeru Okikura, yang mengklaim bahwa suara dari pembicaraan masa depan dia, dan yang telah membawanya ke toko.