The more I think about how short it is the more I become sad. It's such a masterpiece that it feels like it never finishes.

There's a 21st student in the class and no one has any damn idea about whom it could be??, Ummm maybe a ghost or maybe no, there have always been 21 of us, that's must be merely a misunderstanding, but wait .... why did they mentioned there were only 20 student, don't they see that we have 21 in our attendance record, I guess we should count, wait, 1,2,3,4............. 18,19,20,21, huh?? 21, See I told you it's 21 of us, ahhh let it go, that's definitely a misunderstanding, no, no.... wait, then why are these creepy things happening around us all of a sudden, why others aren't able to se all 21 of us, I guess there's definitely a ghost in here!!!! It's all tangled how would we solve this??

That's all a big tangled confusion and question, whether there really is a ghost in there or not, if yes then who??

It gets more and more interesting as the episodes go far, And most importantly it's all logical no dumb bound story. I suggest you should definitely be watching this.