Amaterasu and Issun stumble upon a constellation that warps them to an alternate universe. Within the events of them trying to return to Nippon, they meet a strange wolf named Link that Ammy begins to fall for. With an open tear between the two worlds chaos stirs, and the real adventure begins.

In 1983 Mickey discovers a message, composed by Walt Disney during the final months of his life. The message takes Mickey and friends on what was meant to be Walt and Mickey's last adventure together. But later messages reveal the adventure is not just for fun. It's a race against time for Mickey to save a life worth more than diamonds to his father.