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

Also known as

Native

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~

Romanized

Nankoufuraku no Maou-jou e Youkoso: Debuff wa Fuyou to Yuusha Party wo Oidasareta Kuro Madoushi, Maou-gun no Saikou Kanbu ni Mukaerareru

Fan names

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~