Kankinjou

A man is kidnapped and blackmailed by a woman who seeks revenge on him for something he can’t remember.

A twisted manga to say the least. Besides the sexual assault, entrapment, and other horrible things the antagonist punishes the protagonist with, the story spreads its web of terror around other characters and slowly reveals the reasoning behind the woman’s revenge.

The revenge stuff is pretty gross so I haven’t continued it past the 1st volume. I’ll probably go back to read spoilers about what the big reveal was later after it’s finished. 

I think the manga artist’s afterword says it all: “If you’re interested in this story, there’s probably something different about you. And if you’re enjoying this story, you probably have issues that need to be addressed. I suggest walks and masturbation”.

~dakazu