I am someone who likes edgy manga. When I say "edgy", I mean a manga that unites two things: originality and transgression. A manga that merely violates taboos is not "edgy", it's just offensive. In this sense, my application of the word "edgy" to a manga is a compliment of the highest order.
Gyakusatsu happiendo is a very, very edgy manga. It's plot is a combination of two very popular devices - death games and time loops - that I don't think I've ever seen before. The main character is not a moralizer and is not afraid to kill to get what he wants. In fact, none of the characters are really "good" people, something my cynical, misanthropic self is very satisfied with.
I would absolutely recommend this manga to anybody who likes gritty shonen thrillers like Ajin, Bokutachi ga Yarimashita, Fire Punch, Mahou Shoujo Site, etc.
