The game’s full title is actually Monster wo Taoshite Tsuyoi Ken ya Yoroi wo Te ni Shinasai. Yuusha Tai ga Maou wo Taosu Sono Hi wo Shinjiteimasu. (Defeat Monsters to Get Strong Swords and Armor. We Believe in the Day the Heroes will Defeat the Demon Lord.) Mon-Yu is the official abbreviation.
Mon-Yu is developed by the staff behind Undernaughts: Labyrinth of Yomi, with character designs by Mota and monster designs by Akifumi Yamamoto. Its staff includes producer Hajime Chikami, director Motoya Ataka, and composer Naoaki Jimbo.
Watch a teaser trailer below. Visit the teaser website here.