This is my favorite one, and has been for five years. I don't recommend it if you're not into psychological stuff! x
This goes to my favorites because the characters are simply great. Also, the drawing is splendid, just how I like it. I think that if you give it a try, you will definitely love it. x
UPDATE: THEY JUST BROUGHT OUT THE ANIME! YAY
UPDATE 2: Okay, so when I first read this I was... Idk. Say, 17 and very naive. I tried to watch the second season and I couldn't pass up the fact that the little brother is TOO FUCKIN YOUNG and this is PEDOPHILIA and I can't look at it the same way now.
The first one-shot is enough to put this on my 'favorites' list. Read it now. Also, the chapters after that (the ones about 'The first thing I do in the morning') are not in order. x
This one is a very cute one. This author likes to play with fluffiness and a character development, which makes me love their work. Also, you can laugh so much reading this. You get close to the people in the manga. You relate. I loved this. x
After School Nightmare