Story:

Exact same story as every Corpse Party game, the series and manga - exactly what you expect is going to happen.

Art:

The art is decent but it is nothing in particular. The artist clearly has his own style that works well, it just happens to be just an average manga in terms of the style and such.

Character:

Miyu Shinohara - A bubbly transgender-female who went to school with the main gang and has a crush on Satoshi (like everyone else) and ended up getting herself decapitated.
Principal - The man who cares more about the school than anyone else, he goes above and beyond to make sure the school is always in tip-top shape, unlike his head which got destroyed by Sachiko.
Teacher - He starts off as a lovely gentleman who truly cares deeply about his students, which is shown to be fake when he openly bullies his students and at one point made a move on Sachiko... let's just say I don't think he met a happy ending.
Yuika - The principal's granddaughter who likes playing with insects by poking them with sticks - it was shown to her first-hand that it was cruel when she happened to end up with said stick through her eye... don't mess with the bugs.