This manga is a really twisted manga without much development.

Basically, it's just a giant mess and it felt as if the author really wanted to make the manga very gory.

I was expecting a manga like Monster, where it was psychological and slightly horrifying; that was a good manga. Ana satsujin is a very simple manga that dwells on death. In a sense, it's "death porn", an extreme emphasis on death to the point where it feels like it's erogenous. There's even a character that gets excited from corpses, which just makes it a tad bit more apparent.

The manga isn't really horrible, but it's not great either. It's just a mediocre manga with lots of gore.