Hello! Thank you for your message. You will need to first add resources from the pack to your Ren'Py game and then swap the default UI with Airi. Here is a good video that explains all default UI elements you have in Ren'Py:
I hope that helps 🙂
Hello everyone! I just released my new user interface asset on itch.io: https://sfilmak.itch.io/kanon-visual-novel-ui
It is perfect for visual novels but can be used in games of any genre as well! Feel free to give it a try and comment on the itch page if you have any questions or need assistance with using it. I would be happy to help!