Failure Frame: I Became the Strongest and Annihilated Everything with Low-Level Spells (Manga) Vol. 3

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 expect: the female knight Mist. Now with a frontline ally, the next step of his revenge preparations can proceed...