Boukensha-tachi: Gamba to 7-hiki no Nakama

An adventurous wild mouse called Gamba travels with his friends to see the ocean but he finds an injured mouse and hears about the violence of white ferret Noroi. Gamba decides to help the mice suffering under Noroi's tyranny.

Gamba, a town mouse with a brave, adventurous spirit decides to go on an adventure to discover the ocean. On his way, he meets a troubled child mouse, Chuta. He says his family and other mice have been killed by a clan of weasels living on a nearby island. Chuta asks a group of ship mice, the bravest of their kind, for help, but when they find out that the villain behind this event is the terrifying weasel-leader Noroi, they give up on helping Chuta. However seeing the hopeless Chuta, Gamba promises him to save the island, his family and the other mice. Gamba and his friends team up to go on their adventure to defeat the evil Noroi and his clan.

After Shijin's concern on the absence of his girlfriend Nagisa, Gamba, Bobo, Gakusha, Ikasama, Shijin, and Yoisho travel to the South Island looking for her, only to find out about a family of Japanese otters, endangered by a wild dog named Black. When Chuta, a badly injured mouse, staggers off a ship in Tokyo Harbor, he bumps into out-of-towners Gamba and Bobo, who are at a party being given by Yoisho, the sailor-mouse. Chuta tells the local mice that he has escaped from Devil's Island, where Norio the evil ermine has crushed the mice with his reign of terror.

Born in the bitter cold of the Ouu Mountains as the son of Riki, the mightiest bear-hunting dog, is the magnificent tiger-striped puppy, Gin! To defeat the murderous Akakabuto—who seeks to build a stronghold deep in the mountains of Ou after defeating his grandfather and father—Gin joins the Ouu Army, his youthful blood boiling with determination!! With only three months left until the final showdown with Akakabuto, his eyes are set on finding true “men” who will fight alongside his comrades to the bitter end against Akakabuto, as he races across the entire land of Japan!!