For most of its five episodes, Master of Martial Hearts is just your typical ecchi / panty fighter anime, with lots of pretty girls beating each other up while simultaneously destroying their clothes. However, it has become semi-infamous for a grotesque ending twist. Although I like my anime to be mind screws, this one just doesn't work.
Long story short, the plot follows a high school girl who needs to win a martial arts championship to save her new friend. Most of the series is played straight, but the last two episodes start to subvert things, asking whether it's really good for you, the viewer, to be enjoying this.
The problem with the subversion is that this takes place too late in the series to be developed at any length. Indeed, most of the last episode is spent just explaining the twist, which still doesn't make any sense. For a subversion to really work, it needs to start early on. Given that we've spent 3 / 4 of the series enjoying the sight of half naked girls pummeling each other, the message just falls flat.