There is two type of people who read this manga. Those who love it. And those who hate it.

Some people say that this manga contains NTR, but that isn't totally true. Kuzu no Honkai (Sick Love) premise lets you know that the MCs don't have feelings for each but for other so NTR by definition can't be related to this manga.

If you've read before some smut, seinen or mature romance, chances are that you will get hooked up with this manga.

It depends on yours tastes. Some people would call this manga "fucked up". If you like the premise of the manga, I think you will likely enjoy the manga. If you don't stay away.