It's complicated with hentai and paper editions, but if one NTR title deserved one, this is it. An amazing trip through the mind of a husband and wife who need to deal with a certain mental situation that is impeding them to have a normal sex life. Some scenes toward the final can be tough due to the intensity of the situation with third parties, but in all a really good psychological manga that happens also to be porn. The quality of the art, despite the scenarios lacking variety (not the focus of this work, obviously), is definitely a positive aspect. Adults only!