Right after jumping off the roof Masamune was caught up in his class transition to a new world.

A throne hall.

The students had all received high-class jobs such as Sage or hero. Except for Masamune, who became a healer, the weakest known occupation.

Cursed at and called incompetent, he alone is banished. After wandering in the darkness, Masamune who received the skill [mischief inversion {extreme}] through inverting the healing magic gained the ominous magic [Encroachment Wave].

Now the strongest, Masamune swore his revenge.

Demons and the white cat tribe, precious companions he met on his journey. Together they explore the new world.