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In order to replace Lazuli's hourglass, which was stolen by the Cactus Brothers, Ham-Hams advances to Djungle-Bell Island with the Cactus Brothers who flew away on a beetle. In the meantime, the girls were exhausted, so it was decided that only the boys, Ham-Hams, would follow the Cactus Brothers. I finally found the Cactus Brothers, but surprisingly, the cactus brothers dropped Lazuli's hourglass into the sea. The sea of Djungle-Bell Island is safe for hamsters to play in the water. But the place where the hourglass fell is so deep that a normal hamster cannot enter. So, Leo and Boss with a mermaid's tail decided to go into the sea together. I waited for a while, but they didn't come back. Worried, Hamtaro dives into the sea to see what's going on. At that time, Djungarians in Dolphins costumes called out to Ham-Hams. It seems that there is a very scary monster in the area where Boss and his friends crawled. If you want to go save your friends, they'll give you a costume that allows you to swim in the sea. If you wear a costume, you can breathe even in the sea. Ham-Hams decided to go help Boss and others by borrowing a costume from the Dolphins. The sea is very beautiful, with large and small corals and colorful tropical fish. Ham-Hams who swim comfortably and smoothly. Then, suddenly, a huge octopus appeared in front of me! Surprised, Howdy threw a stone at him, and the octopus got angry and wrapped Howdy and Dexter up with his twisted legs. Hamtaro and his friends bit the octopus to save Howdy and the others. Then, a Djungarian in an octopus costume appeared and attacked Ham-Hams. The Dolphins also came there and started fighting with the Octopuses. Oh octopus, who was asked by Mr. Octopus, caught Hamtaro and Dolphin, and squeezed them tight. Dolphins and Octopuses never stop fighting even though they are caught by a big octopus. Boss and others who heard the noise came there. At the request of Boss and the others, Mr. Octopus lets go of everyone he's been holding. Actually, Mr. Octopus is very kind. But Dolphins and Octopuses are fighting over a playground in the sea. Mr. Octopus, who had grown tired of fighting, kicked Dolphins and Octopuses out of the playground, telling them not to use the playground until they got along. Ham-Hams playing in an amusement park in the sea. Seeing everyone having so much fun, Dolphins and Octopuses decided to play together. Hamtaro and his friends return to the beach with the hourglass that Mr. Octopus picked up. When the hourglass is shown to the girls who have reached the beach, everyone is overjoyed. However, the Cactus Brothers flew in on a beetle again, snatched the hourglass from Boss's hand, said, "Thank you for picking it up," and flew away again...