the series gekkan shoujo nozaki kun is one of my favs too, glad u r reading it!
ah neocities stopped allowing external widgets/scripts in 2022. that may be why the guestbook isn't showing up properly. here's a guide i used to get external stuff like status cafe working on my site https://petrapixel.neocities.org/blog/neocities-external-widgets
IT WORKED!!! TYSM!!!!!!! still don't know why it didn't work on neocities, i never had a problem with status cafe and similar stuff
this reminded me to make a button ill be sure to link u back :D