This is literally an anime made to fill time while the real life Akiba 48 concert crew get the stage ready. There is barely anything here, just basic Kindergarten Backgrounds drawn in 2d, with 2d images shaking back and forth, on top. The animation is made up of still images which shake and occasionally change to a different expression, comparable to an in engine video game cuteness on Sega Saturn or PS1. The character designs and art style is actually nice in some areas, with each of the students based on different underworld monster. There is a kobold / bat like monster who sadly doesn'teven have an entry on this page despite being a major reoccurring character, but that kobold / bat was the coolest character by far.
The characters are... actually fine, they're just various stereotypical characters you would expect from any comedy about being a teacher at a kindergarten. If you have seen Hanamaru Kindergarten or Gakuen Babysitters you have seen all of these personality types but way more fleshed out and thus more interesting. At least a few of them had funny or sweet scenes. There is a character who seems to resemble a kobold or is somewhat bat-esque (resembling the old and nostalgic style of interpreting imps and kobolds as being kinda fluffy and bat esque), and basically this character had a decent amount of good scenes, they were dealing with an unrequited crush (they had a crush on a girl who is based on demons that trick guys into doing things for them, basically, so this bat character had no chance of the crush working out.) And also the bat character has a running gimmick of setting the teacher on fire out of boredom or because the teacher is very polite and that makes them act out. It was a little bit funny.

Conclusion
There is barely anything here to critique but also barely anything to praise. This is a purely comedy anime, with animation that is not notable and barely any notable traits except one character I found to be decent. The teacher is also fine, he is not unlikable, he works as the polite, passive and easily manipulated adult character that allows all the childish antics to happen. Having only one character I really like and only one other character I felt "ok" on, is not very high praise. Watch this if you just wanna see some cool designs that remind me of Studio SHAFT (with zero of the quality of animation of Studio SHAFT)