OH BOY HAVE I GOT SOME NEWS FOR THE UPDATED VERSION
So if you equip each effect as per the library book you get to see more text about the world, or an event, etc. and it's all from Urotsuki's point of view. Which is INTENSE because we're getting some narrative from Urotsuki herself on things in her dreams. Some stuff she says is just ridiculous (put on the Spring effect, touch the book, all she says is "Jump Jump Again Jump" and then finishes it with "jump jump jump jump jump jump jump jump"), some is stuff you yourself would say (Gakuran effect, she talks about Monochrome Feudal Japan and she says "This world is huge. Really freakin' huge." or something to that matter)
and then some is just downright traumatic.
When you equip the chainsaw and go to the chainsaw bookshelf you get text about Aoshiru's event. Here's the screencap. I spent 35 minutes translating the entire thing because I'm terrible at translation.
"I want to forget.
Don't look anymore.
Don't listen anymore.
Don't talk anymore.
Don't feel anymore.
I don't want to remember anymore.
I don't want to meet you anymore.
I don't want to see you anymore.
I don't want to hurt you anymore.
I... I... My previous self...
Disappear... Don't exist..."
Other stuff is that if you use the child effect on the corresponding child book you get transported to the hospital as noted below. There's a cat that says some stuff about their favorite maps/songs/whatever and I think it's multi-staff commentary.