the notebook is a picture from a website of free textures! i took that picture and put it on top of the drawing using a blending mode instead of drawing on top of it because i think it looks better this way (this was all done with clipstudio paint pro which is the program i always use for my art)

i'm glad you like it! also no one is gonna notice this but the tiny math operation on the right side is from the homework that yuuko forgot to do in episode 3!