Konosuba: Sekai ni Shukufuku wo! Movie: Kurenai Densetsu

After receiving a warning that Yunyunundefineds hometown is in danger, Kazumaundefineds party is relieved to discover itundefineds only a joke...until it isnundefinedt. The Demon Kingundefineds general has just arrived to obtain The Mage Killer, a weapon with world-ending power.