The group of privateers known as the Blue Steel continues their mission to deliver blueprints of the Vibration Warhead Torpedo—a weapon that may turn the tides of war in their favor—to the United States. However, a new threat arises from their enemy, the overwhelming Fleet of Fog in the form of "The Student Council.," This is a group of warships composed of the remaining Mental Models—the ships' humanoid avatars—who have yet to face the unpredictable captain of the Blue Steel, Gunzou Chihaya. As the Blue Steel gets closer to understanding the origins of the authority controlling the enemy, Iona's past starts to reveal why the war began and her reason for siding with humanity. [Written by MAL Rewrite]

One year has passed after the great battle against the "Orochi" (gigantic snake). Tenka had been paralyzed from the final battle and he took part of the government's human experiment before the battle. Tenka withdrew himself from society, but his younger brothers, Soramaru and Chuutaro, find out the secret past about their older brother. (Source: Amazon Prime Video)

Fuuma ninja clan is a secret ninja tribe that is waiting for the "Orochi" (gigantic snake) to resurrect for generations. Shirasu and his twin brother Ichiu grew up in this viscous environment and this tells how they become the leaders of the clan. (Source: Amazon Prime Video)

The three brothers discover that the human experiment banned after destroying the "Orochi", is still going on to secretly revive the evil snake. They also find out that some ex-members of the Yamainu (the Japanese military unit formed to kill the snake) are behind this conspiracy. The brothers fight together again in a battle against the military. (Source: Amazon Prime Video)