Synopsis

Miyuki (Ikeda Elaiza) was in her third year of high school during the summer when a transfer student named Yasuhiko (Adachi Kei) arrived. He had read a certain novel, harboring admiration in his heart, and was a time traveler who had leaped from 300 years in the future. After sharing his secret, Miyuki gradually falls in love with Yasuhiko as they spend time together. Then on July 21st, destiny makes a significant move. Miyuki uses the medicine given to her by Yasuhiko to time leap and meet her ten-years-future self. The future Miyuki shows her a book and says, “You can definitely write this novel… Because I was able to write it.” It was the novel Yasuhiko would encounter in the future. After returning from her time leap, Miyuki sees Yasuhiko off as he returns to the future. They exchange a promise: “I will write our story from this summer and definitely complete the time loop”..

Ten years later, Miyuki, now a novelist, returns home with the novel she has finally published. She plans to show it to her younger self who would be coming from ten years ago. However, on the destined day, no matter how long she waits, the high school-aged Miyuki does not appear. While investigating the mystery, Miyuki attends a class reunion, where her classmates eventually reveal a shocking truth to her.