Welcome to the classes of horror! I will be your guide to a world that lurks under everyday life. For these lessons, you don't need text books or notebooks. 4l1op
If you're prepared for the worst...
20 Volumes (Complete)

I have a soft spot for light shoujo horror and, as a result, breezed through all twenty volumes. What I liked about these stories was that they often began as if they were normal shoujo stories and it was fun to see how shoujo cliches (jealousy, love triangles, cheating, betraying friends) could take a darker turn. The stories are character driven, focus on the psychological aspects, and aren't too gory, which make them ideal for me to read before going to sleep.
However, the stories are quite limited. Perhaps because the target demographic is grade school girls, some of the stories seem to be trying to impart very basic moral ideas or life lessons (don't litter! don't talk to strangers!) and for these stories I could predict what would happen after reading only a couple pages. Many of the stories also have similar characters and settings which makes them feel repetitive.
It's a light horror obviously targeted for kids/teens. I actually can't handle with horror stories well so it's perfect to me. And if you like this story, I suggest reading "Chocolat no mahou" (idk if they're translated though)
This series was published in Ribbon magazine, which has a target demographic of girls age 7-13 or so. Which makes me find the various comments here nitpicking the juvenile nature of the stories to be off base. Of course they're not very scary: The magazine targets an even younger demo than Shounen Jump.
Judging it on what it is, and what its trying to accomplish, I find it more or less hits the mark. Suspense that doesn't shock too much, with a "moral of the week" attached to each chapter. And seeing as it went 20 volumes and now even has a continuation in Ribbon, it must be doing something right.
Really cute stories but not much horror, I can read it before I go to sleep like a bedtime story just fine. One or two legit creepy monsters but mostly mediocre horror stories with mediocre lessons. I like it though, it's surprisingly unique. Oh no the stories are super cliche and bland but it's the complete wackiness of all this happening to little kids that keeps it interesting.
We're kind of used to horror stories following teenagers or adults and only featuring creepy kids, not bad things actually happening to little kids. When a kid dies in a horror it's supposed to be tragic, not a lesson. These kids get no second chances, be a brat just once and you get brutally murdered. Now that's what keeps it creepy. You better not read this before you go through puberty, it'll scare you into a saint. It gets me, someone who has no tolerance for brats, to ask "Come on do they really deserve that?"
For the first few chapters, I considered this series to be "So Bad It's Good". You couldn't go past any page without something to nitpick on.
But 3 volumes in and it's getting really old really fast. In my opinion, the key to good horror are good, relatable-to-an-extent protagonists and stuff that makes sense. Well, to be fair, anything supernatural doesn't make sense per se but at least SET IT UP properly so readers will be intrigued with how anything out of the ordinary affects the plot. Here, it's just random bulls**t that happens to crazy people. The monsters aren't even unnerving
Most of the stories got me frustrated with the protagonists - they're just plain crazy. Yes, it may be appeal to some people, but they just don't work for me. Their insane antics almost always stem from misunderstandings, shallow jealousy (this pisses me off the most), and anything else typical of stupid juveniles. Their demise just gives me morbid satisfaction.
Still, there are some stories that I 'appreciated' (note the word used). For instance, the Hell Clock story was kinda nice, though its probably because the protagonist was on the more decent end of the scale. She made sacrifices for the one she loved, and that's always an irable thing to do.
I sincerely apologize, this is quickly becoming a rant. This comment will surely be updated once I finish all available chapters.
I think that the only thing that truly scares me about this story is how the characters are all in middle school or something. It's obviously fiction, but just thinking about how twisted some of the characters are gives me the chills.
That being said there's not much more to write about. There isn't any true horror in here, some creepy moments here and there, that's all. That being said I'll still keep on reading it since I don't want to leave a series unfinished.
If you're looking for some mild scary stories then this one is for you.
I will say that as far as "horror" goes, these stories are extremely tame, and the cast of characters invariably being little early grade-school girls makes the intended audience pretty obvious. That being said, though, when taken in context as shoujo manga, it could be a lot worse. While it's definitely pretty tepid and doesn't offer a lot for an adult horror fan, the individual stories are sometimes a bit clever, and it's not afraid to get pretty dark at times. For the age group it's written for, this could perhaps be seen as a pretty effective piece of work. It's just a little lacking in maturity to appeal to readers outside of that demographic. Perhaps think of it as a shoujo manga-style Tales from the Crypt.
A lot of the stories are really childish horror stories that many people grow out of by the time we reach high school. Its not "bad" per se, but its definitely for very young audiences.
That said, its honestly not too good either. A lot of the horror ultimately circles back to one of two things.
I expected to be titillated, intrigued, or at least made mildly paranoid, but these stories would have been scarier if I was, say, 13. The stories are more like those kids horror stories on TV, y'know, like "Goosebumps." If you know your anime, then "Thriller Restaurant" (Kaidan Restaurant). When I picked it up I was hoping for something like, I dunno, Ghost Hunt or something that actually was scary. It's okay, if you're looking for something that's not gory-type horror, but there is violence, monsters, ghosts, and "weird" things afoot.
Scary Lessons is right... Each chapter tells a different didactic story with a central moral to be learned. I'm to v2 ch6, and the stories are mostly creepy without being too horrific to read. They remind me a lot of The Twilight Zone or Outer Limits.