Fenrir’s story follows him, his sister Mun, and his best friend Tyr as they travel and train under the gods and warriors Baldur, Thor, Frey, and several others.

Fenrir is an outcast of sorts, given that his father, Loki, is despised among almost everyone in Asgard and because Fenrir shows no magical inclinations or "true" Asgardian strength. He quickly discovers that he is very unique when his Sealing powers are unlocked and he is informed that he has a near limitless potential and a peculiar destiny. Training alongside his generation of young warriors, Fenrir discovers what it takes to become confident in himself and his abilities to protect his comrades and sister.

But there are forces working against the young warrior as his father Loki manipulates Fenrir for his larger aspirations. Odin, the ruling god, also wishes to hold Fenrir’s blossoming and incredible powers back in order to orchestrate his death to avoid the cataclysmic event, Ragnarok by any means necessary.