A quick and simple guide to help you unlock the cat :]
Items
You will need 2 items equipped to unlock the cat.
First is the cat tail, which is already unlocked.
The other one is the cat glasses, they cost tickets.
Getting the cat
Once you have both items equipped, you’ll want to make your way to the library. It is located behind the canteen.
Next, you need to focus at one of the tables in the library. Any works, but make sure to select the reading focus.
Stay in this focus for roughly 5-20 minutes. Eventually, there will be a pop-up on the screen to indicate you received the cat!