While the title suggests a story of simple, everyday school life, the contents are more the opposite. The setting is a strange school where you may see the principal wrestle a deer or a robot's arm hide a roll-cake. However there are still normal stories, like making a card castle or taking a test you didn't study for.
Characters are charming with cuteness overload. You can literally find every type of anime character here. Which means there's at least one character for every person to love or maybe more than one.
This has to be why this anime is so great. Its the definition of Japanese humor, which not everyone will understand sometimes but Japan already has an image of being weird so you can expect literally anything on this one. If I had to compare this to another anime it would be "Shin-Chan". No lack of humor and no dull moment.
The soundtrack is nothing special but it feels somehow satisfying, as mentioned before, the cuteness overload. It just fits perfectly with the animes theme.
If you like Japanese humor in all its glory, you will love this one, unless you don't and also hate all the cuteness that's gonna be thrown at your face.