I found most of the art on Osora-Sensei's twitter page
Actually, instead of me reposting them all in here, you guys can go visit the twitter page and scroll down (I'm too lazy)
Some of the pictures not found on the twitter page are illustration cards or title pages or something of the sort which you can find if you buy the book, or maybe it was for a promotion or something, I don't know. I found them by going through google... (Hey, I'm a big fan of this series, just like you, ok?) Again, too lazy to upload pictures here...
Here is Narita-Sensei's Pixiv page.
This is where I found the facts for some characters.
This is the new piece of work Osora-Sensei is working on. If someone wants to translate it, that would be great XD
I'll try and translate some of the pictures...
Chp.18 Bloopers
Himeko: Stop it, Shuu-chan!!
Shuuji: Gross!
Aoyama-kuuun
Defense, defense
Lots of "Aoyama-kun"s
What is it?
If there's any questions or something, feel free to ask.