Satoru Fujinuma is a struggling manga artist who has the ability to turn back time and prevent deaths. When his mother is killed he turns back time to solve the mystery, but ends up back in elementary school in Tomakomai, Hokkaido, just before the disappearance of his classmate Kayo.
On July 27, 2018, the BokuMachi anime’s official website announced a stamp rally in the city of Tomakomai that ran from July 28, 2018 to December 16, 2018, with stamp rally sheets distributed from the Tomakomai Tourist Information Center. The city also produced a location website and an official Seichi Map PDF.