Walk to the north to enter the library court.
You can find Jo’s Koffee stand here. Talk to everyone, especially to Jo and order a coffee. It doesn’t really matter how you take it, as long as it’s coffee. Also order a hotdog although not encouraged by Jo.
Walk to the left and meet Jeeforce. Talk to her and find out what she’s doing. It’s an earthquake drill. Walk to the right and look at the object on the street. It’s a BIKE PART. Pick it up and walk to the north. Talk to Jo again and guess what? She was missing a part of her bike this morning.
So there’s another mystery solved.
Game source: A copy of the game was found here on the internet.