Escape from Classroom

This game is a game to escape from one classroom. The classroom is not very big, but many hints are hidden. Also, up to 3 classmates will visit over time. Find items, reason, and escape from the classroom! Up to 3 students will visit over time. The biggest thing is that your action changes the number of visitors. After a certain time, it will return to the time when the game started. Return many times, let's deduce the mystery of this classroom!