Diva Mizuki is famous for her fantastic big knockers... but has been them the real reason of her being chosen from the mysterious artificial intelligence in the key science lab as the main test subject? And what type of science laboratoy makes the exam subjects to fuck each thorugh the portal site? Well, may be you will figure this out later but in order to do that you will have to solve the tasks that this main AI will set for Diva Mizuki such as succesfully perfom three titfucking experiments until the time wil workout. Overall there'll be 10 levels to complete but do not expect this to be an effortless rail - every new degree is the minigame with enhanced problem... yet at precisely exactly the same time the quantity of sexual material is going to be enhanced also. By the way this game is suggested to all devotees of"Portal" series.