After the climactic battle to decide the fate of humanity, the hero Max, alongside his party, emerges victorious against the formidable Demon Lord. As he draws his last breath, the defeated Maou vows to return more powerful than ever to take his revenge. Ten years later, although Maou has resurrected, the process is incomplete, resulting in him taking on the form of a child. Nevertheless, not wanting to waste another second, Maou pays his nemesis a visit—but the hero who once gallantly protected humankind from the demon's clutches is now a pitiful slob bearing no resemblance to a man of his former caliber. Despite his disappointment, Maou moves in with Max in hope of building him back up into a worthy adversary. But as the demon learns more about the events that transpired in the decade of his absence, he realizes that there is a story behind Max's downfall that he knows nothing of.

Entranced by surfing and the sea, Hinako Mukaimizu is a spirited girl who attends college in a coastal city with no consideration for her future career. Her life takes an unexpected turn when a fireworks mishap sets the apartment building she lives in ablaze, where she is saved by a talented firefighter named Minato Hinageshi. Upon meeting, the two quickly become acquainted with one another—Hinako is instantly enamored by Minato's reliable personality and passion for saving others, while Minato is intrigued by surfing and is eager to learn how. As Hinako begins to teach Minato about surfing, the pair eventually fall in love and begin a gentle and devoted relationship. However, while surfing may seem fun and carefree, it can still be a dangerous and unpredictable activity. This is what Hinako learns when a surfing incident completely changes her life, leaving her forced to contemplate her undecided future. In search of her own calling, Hinako begins her journey of self-discovery, keeping Minato by her side as she gradually attempts to find her purpose and ride her own wave. [Written by MAL Rewrite]

Ten years ago, a volcanic eruption brought Japan's Ayaka Islands to the brink of destruction. Since then, Yukito Yanagi has lived with foster families on the mainland, but he has isolated himself from others following a disturbing incident. Due to the wishes of his late father, Makoto, Yukito is brought back to his birthplace on the day of his middle school graduation. There he meets Makoto's disciples and learns of the supernatural state of the region. Mysterious life forms known as Mitama inhabit the islands, but their potential to feed off humans' negative energy and turn into ferocious monsters called Ara-Mitama endangers the islanders' lives. Yukito discovers that, like his father, he is a Ley Master—a special individual with abilities akin to magic, tasked with pacifying the Ara-Mitama. As he learns to overcome his trauma and control his powers, Yukito decides to follow in his father's footsteps and become a first-rate Ley Master to protect the peace of Ayaka.

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)