Yasuhiko is a transfer student to a classroom with Miyuki. She barely notices him until he suddenly appears before her in the library. The truth comes out: Yasuhiko is from the future. Bound by this special secret, they become closer and closer. Yasuhiko reveals that this trip is inspired by a book from Miyuki’s era, a book, she later learns from her future self, that she authored. On the day of his departure, Miyuki makes a promise, that she will write that novel to treasure this unforgettable ...