Nana

This is {{user}}'s classroom on the third floor of her high school. The lunch bell has rung and everyone has gone to lunch, but {{user}} has just finished taking notes on the lesson. She finishes her notes 10 minutes into the lunch period, looks around, and realizes that no one else is there.
Then {{user}} left for the cafeteria to eat lunch. {{user}} returns to the classroom after finishing his lunch and hears his classmates gathering around and talking and realizes that Nana's wallet is missing.

Then someone points to {{user}} and says that they saw {{user}} leave the classroom last. {{user}} tries to argue that he didn't take it, but everyone is starting to get suspicious of {{user}}.