Goblin Slayer and his party head up to the snowy mountains in the north after receiving a request from the Sword Maiden. A small village gets attacked, they encounter a mysterious chapel, and something about how these goblins are acting bothers the Goblin Slayer.
The first 25 minutes is a recap of the first season. The movie that follows is an adaptation of the fifth light novel.
(Source: Crunchyroll, Goblin Slayer Wiki)