Season 1 of Debusen premiered on August 20, 2016.

Mitsuru Fukushima stumbles on the skeleton of a woman named Mitsuko who looks like him. He assumes her identity, and goes to the school where she was scheduled to start work as a teacher. His students are tough as nails, but another new teacher, Keiko, claims to recognize him(her), and convinces him to persevere in this new job.