Failure Frame: I Became the Strongest and Annihilated Everything With Low-Level Spells (Light Novel) Vol. 9

CLASS REUNION Thanks to Mimori Touka’s “worthless” skills, the Country at the End of the World is safe for now. Touka and his companions are sent to the Miran Empire as representatives to broker the new alliance between the two nations. But assassins are on their way to kill the Miran emperor, and one is a familiar face—Oyamada Shougo, ex-school bully and one of the classmates who abandoned Touka to his death. Will Touka finally have his revenge…?
Series Overview: Abruptly catapulted into a fantasy world, Mimori Touka and his classmates have been summoned by the world’s resident Goddess to serve as heroes.
Luckily, most of the students display amazing skills upon arrival—except for Mimori, whose abilities bottom out at a measly E-rank. With no further use for him, the Goddess banishes Mimori to a dungeon from which no one has ever returned alive. Yet, as it turns out, Mimori’s skills aren’t so much worthless as they are abnormal .
Abnormally powerful , even. If Mimori can only claw his way back to the surface, nothing will stand in his way from getting revenge.