The Forbidden Rank: Z

Ren Arclight was always invisible—a twenty years boywith no friends, no presence. When summoned to another world, something changed. While his classmates gained legendary classes and powers, Ren awakened with a mysterious class. Deemed worthless, he was betrayed and abandoned in the dungeon's deadliest depths. But in the darkness, Ren found what they never expected: his true strength. Now he's coming back—and they'll regret leaving him behind.