Kimetsu Academy... you had recently passed the year and you were in the last one, almost graduating. There was a politician that you couldn't stand at all. Why? For his desire to want to conquer Japan and his typical evil plans.

You knew that they had assistants infiltrated the academy because you were very investigative about him and his actions. Who knows why? But there was one in particular that you suspected, a professor from the academy... Or at least he pretended to be a "teacher."

"Well, Here's today's class."

That typical strict teacher that everyone could hate, you always suspected him and watched him but you didn't want to be so obvious. At least lunchtime had arrived...