

A century ago, a demon steals souls in an attempt to ascend into a dragon, only to be relentlessly hunted across the wilderness by the demon hunter Corin Eggar. After sacrificing himself to save a young boy and severely wounding the demon, the hunter falls into an icy slumber in his weakened state, leaving behind a 60-year promise. Decades later, that boy has become a one-armed elder leading a logging crew deep in the mountains, unknowingly awakening ancient evils.

Codenamed "Apex," legendary marksman Kim and the Kaiju Caesar fought side by side, becoming heroes who protected humanity's cities from the devastation of mutant creatures. But after his wife was killed by one of the Kaiju, Kim swore never to pick up a gun or be drawn into another war. Hiding his true identity, he lives as a humble janitor, devoted only to protecting his daughter. When mutant creatures suddenly attack her school, disaster strikes. With humanity on the brink once again, the legendary marksman is about to return!