Synopsis

Butt Detective the Movie: The Secret of Souffle Island
A written notice from Phantom U has reached Souffle Island, where winds blow throughout the year. His target is the island's treasure, the Wind Guide. Oshiritantei visits the island along with the Wankoro police, and there meets the girl Lulu, who flies freely about in the sky. She dreams of the world outside the island, but she's tied down by her familial duty to guard the big lighthouse that is vital to the islanders' livelihoods. On the night of the full moon Phantom U specified, Oshiritantei and the others try to protect the Wind Guide from him, but Phantom U has a "secret plan"... When Oshiritantei's famous deduction shines, the secret hidden on the island will become clear!

Shinkai No Survival
Geo, Phoebe, and Dr. Gong board the Ammonite Submarine for a deep-sea survey. On their way down to several thousand meters of depth, they get caught in some methane gas bubbles, and the Ammonite Submarine breaks down. Now, they can no longer contact Kay, who's up on the surface. Then, a huge sperm whale and giant squid attack, and Geo ends up getting separated from the group! Phoebe and Dr. Gong go to rescue Geo, but the Ammonite only has a little bit of energy left...

Meanwhile, Geo is surrounded by deep-sea creatures on the pitch-black ocean floor! Will they manage to make it back safely from their extreme deep-sea situation!?

"I'll be sure to survive, just wait and see!!"