Gamba, a brown mouse, embarks on a sailing journey with his childhood friend. They gather experienced mice sailors at a harbour. They encounter Chuta, a mouse who has been injured and is seeking help. He appeals to both Gamba and Bobo to assist him in defending the island of Yumemishima and its inhabitants from the cruel and wicked invading Noroi Clan. Gamba decides to sail to Yumemishima with Chuta to help defend the island, and recruits more mice along the way to join their cause.
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