Detective Green, the sea turtle, is on a case. He visits southern coral reefs, western sandy shores, and eastern faulted coasts, finding the same problem at every place. Follow Detective Green as he uncovers the truth!

Three friends are invited to the “Future Oceanarium” Inside, they see a world where the sea is polluted and marine life is disappearing. They realize that changing the future begins with small choices, like using less plastic each day.

Johnny from the United States is excited to attend Xiao Ding and Xiao Mei 's wedding in Taiwan. But he notices something odd - every dish on the menu says "MahiMahi." Curious, he asks Xiao Ding 's cousin Da-Gu what it means. Follow Johnny to discover the story behind this mysterious fish!

A little whale goes out with her mother to visit ocean friends, but all she sees are floating plastic bags and straws. They meet an octopus whose home is piled with trash. The little whale asks her mother why the sea looks like this, but her mother stays silent and keeps swimming...

A hermit crab carries a bottle cap as its home, and a dolphin’s body is twisted from being trapped in a fishing net. Single-use items made by humans have turned into ocean trash. What can we do in our daily lives to help reduce all this plastic?

Ah Ming made a living by bringing the fish he caught to sell at Kanzaiding fish market, supporting his whole family. One day, the teacher bought fresh milkfish from Kanzaiding and cooked it for the students. The taste of fish from Kanzaiding carries the story of our community.

On the way home, sea turtle Xixi records his journey with a camera. He sees plastic bags drifting in the ocean, coral reefs turning white, and waters of a strange, unnatural color. Even the hermit crabs in his hometown now live in plastic shells. After returning, Xixi looks at his photos and wonders what changes he will see next time he comes back.

A plastic bottle tossed into the ocean begins an unexpected adventure. Floating through blue waters and colorful coral reefs, it sees turtles trapped in nets and jellyfish tangled in plastic bags before finally washing ashore to meet its "companions."

Herman follows the sound of the ocean to find his father in the central seas. He meets the ancient sea beast Leviathan, whose blood turns to gold and silver. Herman's hometown grows wealthy, but the ocean slowly suffers from pollution and human activity.

Lele the sea turtle loves helping others. While exploring the ocean, he comes across a seahorse stuck on a hook and a clownfish trapped by a plastic straw. Eventually, he sees humans cleaning the beach, and at last, he and his friends can swim freely in a clean ocean.