The Secret Hidden by the Cards

what happens

Mitsuhiko and Genta enjoy playing a trading card game against each other at a table set up in a used bookstore. Conan, Ayumi, Haibara, and Professor Agasa are with them. TCG tournament regulars Nitta, Masaki, Zaizen, and Kuno show up. As usual, Zaizen heads to the bathroom before the game. He instructs Kuno to watch his valuable rare cards, so Nitta, as well as Conan and his friends, move away from the table. Suddenly, the store enters a state of chaos...