Hall of Corruption my beloved, putting out one banger after another. I've never bothered trying to compile a personal top ten h-games list, but this would be a serious contender if I did; its up there with Parade Buster for H-games with really fun gameplay. You go in expecting the typical fanfare of mediocre rpgmaker combat, then you find yourself playing a hack and slash that keeps finding new ways to mix up the game without overstaying its welcome. 
Story is well paced, with some neat twists here and there, and the cast is enjoyable, Ruri in particular is a girl worth staying pure for. HoC's H-content is as good as ever, but man do they go for a gut punch in Black Oni's scene. Legitimately couldn't bring myself to finish it. Closest thing I have to a complaint is that more endings would have been nice, Ruri may be best girl, but she had stiff competition.