Gintoki and the others were tossed into the ocean on their way to Ryugu Palace and are now stranded on an unknown deserted island. They search the island for any resources to help survive and are reunited with Kamenashi. Amazingly, the island was Ryugu Palace. Meanwhile, giant turtle robots have appeared in Edo and Gintoki and the others hear about it on the news on TV. According to Kamenashi, Otohime, the owner of Ryugu Palace is carrying out a devious plan.
Do you want to know why Ryugu Palace
has dwelled in the oceans of...
¿Quieren saber por qué el 
Palacio Ryugu ha residido
Quer saber por que o Castelo do Dragão
 habita há tantos anos nos oceanos...