Nishio Gakuen is a manga that is not for everyone. Why do you ask? Well, it is a manga that includes characters from Nisio Isin's works. So if you haven't read or watch any of Nisio Isin's works such as the Monogatari Series, Katanagatari, Zaregoto Series, Boukyaku Tantei Series, etc. Then this manga is not for you to read, since all Jokes and references will just be "nonsense" See what I did there? A reference.
All jokes aside, Nishio Gakuen is a very interesting and funny manga if you are a fan of Nisio Isin or just a person who seen any of Nisio's works. The
art really fits the story, since there is no actual serious plot, it is just a comedy fan-service for Nisio Isin fans like me. The author of this manga Mochi Shiba who is very unknown to me did a good job making this! He really wrote every detail and jokes carefully as if he is also a fan of Nisio (He might). Like I said earlier, if you have watched or read any of Nisio Isin's works then this manga is very highly recommended to you!
Just a short review because there is nothing extravagant in this manga, it's just a pure comedy between Nisio Isin's characters fooling around, I am a huge Nisio Isin fan and as a parody-comedy manga, this is an overall 9/10!