The official website and accounts for The Demons Are Planning Something Good anime today revealed a 2027 broadcast year, a teaser visual and main cast details. Junichi Suwabe (Yami in Black Clover ) tops the list as Lord Mercysnare, director of Demon Lord's R&D department, joined by Wakana Kuramochi (Cuff in The Duke of Death and His Maid ) as assistant Letze and Haruka Shiraishi (Alicia in Clevatess ) as adventurer Merisha. The teaser visual's tagline reads, "Prepare yourselves, Demon Lord's army!" The Demons Are Planning Something Good Anime Teaser Visual Takuya Asaoka ( VTuber Legend: How I Went Viral after Forgetting to Turn Off My Stream ) directs The Demons Are Planning Something Good anime at studio TNK, with Kazuyuki Fudeyasu ( Shangri-La Frontier ) providing the series composition and Hiraku Kaneko ( Immoral Guild ) drawing the character designs. Yen Press publishes Takuji Kato and Gashigashi's original manga in English and describes the story: People don’t truly appreciate the amount of R&D that goes into running an evil army of darkness.