Tried again and managed to get the last book this time, though it took me some time to find it :P. I got outside and hesitated to go back inside the school or go toward the building to see what happened if I did but I'm too scared for that lmao. But sadly I got stuck on the bike outside... The controls were not replying. I got a Unity error message showing up but I'm sorry, I closed it too fast while clicking on the screen to try to get off the bike, so I couldn't read what was written and didn't take a screenshot. Maybe it's because I am on Firefox browser, or because I have an Azerty keyboard? Maybe a downloadable version in addition to the html one would be nice in cases like this :D and the possibility to use arrow keys instead of the letters?