Anime Like Case Closed: Conan and Kid and Crystal Mother
Kaito's the thief and the cop's daughter is hunting him, except she has no idea she's traveling with her target. Conan knows exactly who Kaito is and shows up anyway. The entire OVA is three people on the same train playing a game where only one of them knows all the rules, and that person keeps switching depending on which door you're looking at.
SYNOPSIS
A luxury train becomes the stage for an elaborate heist when Inspector Nakamori and his daughter Aako board with a specific mission: protect the Crystal Mother, a gem of immense value. What neither of them realizes is that Kaito, traveling alongside them, harbors a dangerous secret. He is Kaitou KID, the world's most notorious phantom thief, and he's determined to claim the jewel for himself by any means necessary. Conan boards the same train with a young boy named Philip, both intent on stopping the phantom thief before he strikes. As the journey unfolds, tensions mount between rival objectives. Kaito must execute his theft without exposing his true identity to Aako, while Conan races to anticipate KID's every move and catch him in the act. The Crystal Mother becomes more than just a prize. It's a focal point where secrets collide, loyalties fracture, and no passenger on this train can trust what they see. Only one side will leave victorious, and the price of failure extends far beyond a single gemstone.
