Mimori Touka has always been something of a background character in his high school. So when he and his classmates are summoned to a fantasy land and gifted with incredible skills, it seems like the perfect opportunity to make a name for himself. The only problem? Mimori's skills are abysmal at best, and he's banished to a deadly dungeon. But as he begins to test these new abilities, he discovers just how powerful he's become. Can Mimori fight his way back to exact revenge?!

After surviving the unsurvivable Ruins of Disposal, Mimori Touka plots his revenge against the foul Goddess, Vicius. When he hears of strange magic in the town of Mils, he believes he's found the key to defeating her. With renewed hope and a clear path ahead of him, Touka seeks out the Forbidden Witch to begin the second act of his dark, vengeful journey!

Having successfully conquered the Ruins of Disposal, Mimori Touka is one step closer to exacting revenge on the Goddess who banished him there. Following the advice in The Forbidden Arts, Touka's travels take him to the town of Mils and into its dangerous ruins. There, he seeks out the rare ingredients needed to enhance the powers of his only companion, the slime, Piggy-maru. However, the ruins gift him with something he did not the female knight Mist. Now with a frontline ally, the next step of his revenge preparations can proceed...

With Seras Ashrain's true identity unceremoniously revealed, she's on the run from the Black Dragon Knights, the strongest knight company in the world. To prevent Touka from getting wrapped up in the hunt for her, she escapes the city and disappears. Spurred by Seras' protective spirit, Touka goes after, hoping he can reach her first. Unfortunately for them both, Civit Gartland appears. The arrival of the strongest man in the world changes everything.

While Mimori Touka finishes his battle with the Strongest Man in the World, his former classmates are leveling up under the Goddess' instruction—and becoming drunk on their own power. Their skills are tested when they're pitted against a new foe. As part of his revenge plot, Touka forms a group of mercenaries eager to put an end to the Goddess once and for all.

Mimori Touka sets out on his mission to defeat the Goddess Vicius, now with Seras Ashrain along for the ride. They need to get to the Land of the Golden-Eyed Monsters to see the Forbidden Witch who lives there. No one is sure of the witch's exact location—except for the bloodsport gladiator Eve Speed. Touka wants Eve and her powerful abilities on his team, but there are loose ends that must be dealt with first...

Touka and Seras, along with their new companions Eve and Lis, find themselves pursued by a cultish group of supposed magic users called Ashint, led by the charismatic and calculating Muaji. Ordered to take Eve back to the man who owns her contract, the group is making it difficult for Touka and his cohorts to get to the Forbidden Witch, forcing them into a confrontation. Can Touka outsmart Muaji and his men, or has he finally met his match?

呪術師集団・アシントを壊滅させた灯河たちは、女神を凌駕するための『禁呪』を追い求めて、遂に〝金棲魔群帯〟へと足を踏み入れた。 その地には女神の手引きによりクラスメイトも来訪しようとしていて……。 一方、悪魔の伝承になぞらえ〝蠅王ノ戦団〟と名乗り始めた一行は血闘士・イヴの持つ地図を頼りに、更に魔群帯の深部へと進み、目撃した者が殆ど殺されているが故に実体が謎めいている凶悪な魔物――〝人面種〟と邂逅を果たす。 隙を見せない敵に仲間と連携し、難なく攻略したかと思われたが人面種の放った断末魔が魔群帯中の魔物を呼び寄せてしまい―― 「さあ――全面戦争といこうか」 止まぬ猛撃、尽きぬ敵。 終わりが見えぬ戦いに灯河の選択は……。 復讐の旅路の中で逆境さえも嘲笑う元勇者の逆襲譚、第八幕!!