Prologue

Midoriya Izuku, also known as The Dark Hero: Caliginous, an underground hero, was invited by the one and only Rat Satan to become a teacher at UA. What will he be teaching, you ask? This year, UA introduces a whole new subject, Analysis. During Midoriya's new teaching career, he happens to find one of his few friends from his own days at UA...
.
.
.
Most teachers are in the mid 20s (Midoriya is 25) except characters who are older than the others ( RG, Nezu, All Might, ect).
This is an Aideku fluff!
.
Everything is a fanfiction AU, and only the writing belongs to me!