The Impregnable Demon King's Castle and the Expelled Black Mage of the Hero's Party

Nankoufuraku no Maou-jou e Youkoso: Debuff wa Fuyou to Yuusha Party o Oida Sareta Kuro Madoushi, Maou-gun no Saikou Kanbu ni Mukaerareru / Welcome to the Impregnable Demon King Castle: The Black Mage Who Got Kicked Out of the Hero Party Due to His Unnecessary Debuffs Gets Welcomed by the Top Brass of the Demon King's Army / 歡迎來到難攻不落的魔王城 ～認定不需負面狀態而被踢出勇者隊伍的黑魔導士，被魔王軍招攬為最高幹部～ / 難攻不落の魔王城へようこそ ～デバフは不要と勇者パーティーを追い出された黒魔導士、魔王軍の最高幹部に迎えられる～ In the present era, adventurers, demons, heroes, and demon lord, are no longer occupations that put one's lives at stake. With the world at peace, it is an era where conquering dungeons has been transformed into entertainment. Adventurers and monsters are able to fight with a substitute body made of magic, popularizing dungeon conquests with no deaths. Having lost his job, the "Black Mage" Remme struggled with finding another party until one day a beautiful woman appeared before him telling she had a job for him.