FAILURE FRAME - Tome 1

Tôka Mimori, a high school student who is as discreet as an "NPC in the background", has been summoned to another world with his classmates so that they can all become heroes. But while all around him he is being awarded S or A rank, he is being given E rank, in other words "good for nothing", and finds himself sent to the depths of ruins from which no one has ever emerged alive. That's when he discovers that his 'state-altering skills', useless at first glance, actually allow him to take down powerful monsters!

I'm going to rebel against this world... With these abilities they've made such a mockery of!

So begins the tale of revenge for this outcast hero with extraordinary powers, on the verge of becoming a demon.

By defeating monsters, a teenager gradually transforms into a demon.