I have one! "Ghost at School" - if I'm not mistaken. I watched that anime at the age of 10/11/12 around that age. Every episode has its own ghost(which scare me a lot). I was afraid of that anime(my sisters and cousins used to gather at night time and we watch the anime together- it amused me when I come to think of it) but I still want to know what happens next in the next episode. Seriously, I like this anime a lot!