Welcome to the impregnable castle of the Demon King : Black Mage, who was kicked out of the heroic party for not needing debuffs, is welcomed by the highest ranking officer of the Demon King's army 3

Heretical Black Mage, the strongest debuffer, starts his warriors! In an age when dungeon crawling has become a pastime.... Leme the [Black Mage], who has been discovered for his hidden abilities and appointed as the No. 2 - Chief of Staff of the Demon King's Castle, faces his first defense battle as the Demon Man "Lemegeton. He will fight against the party led by the "Thundering Hero" with his new friends. What will happen next? The third volume of this royal road battle fantasy is about a kind-hearted boy with a passionate heart!

Heretical Black Mage, the strongest debuffer, starts his warriors! In an age when dungeon crawling has become a pastime.... Leme the [Black Mage], who has been discovered for his hidden abilities and appointed as the No. 2 - Chief of Staff of the Demon King's Castle, faces his first defense battle as the Demon Man "Lemegeton. He will fight against the party led by the "Thundering Hero" with his new friends. What will happen next? The third volume of this royal road battle fantasy is about a kind-hearted boy with a passionate heart!