They called his skills worthless—then he turned those 'useless' spells into the deadliest weapon in the world.

When Mimori Touka and his classmates are summoned to another world to become heroes, everyone expects them to have incredible abilities. Unfortunately for Mimori, his skills are rated E-rank, and the goddess immediately declares him useless and banishes him to a deadly dungeon where no one has ever survived. But his supposedly worthless status-effect spells turn out to be anything but weak—and Mimori soon discovers he may have everything he needs to survive and get his revenge.

As he claws his way through a brutal new world, Mimori grows stronger while uncovering the truth behind his summoning and the goddess who abandoned him. With dark fantasy, intense battles, monsters, revenge, and a protagonist who is increasingly willing to embrace the darker side of power, Failure Frame puts a decidedly ruthless spin on the isekai genre.