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This review is from: Ar Tonelico Qoga - Knell of Ar Ciel (PS3) (Video Game)
It was very unique in design to me as there are multiple endings, but you can't actually tell that on a first playthrough. And part of it involves 'diving' into two of the characters to fix their psychological issues (Finnel looks down on herself harshly which apparently makes everything in her mind try to torture her and is pretty dark and on platforms, Saki's mind is more like a fairy tale book which gets destroyed and is essentially rebuilt in different ways each level and Tyria's is more like a memory bank and she doesn't actually have issues, you just follow the lives of one of the characters in it in an interactive manner to learn the truth of her past). However, you don't necessarily actually have to do so with any of them past the first one with Finnel which is storyline related, you can just go about killing things as you wish and continuing storyline as you wish.
The storyline is pretty interesting, though I wouldn't recommend this to anyone under 16 in truth because the girls remove their clothes right down to their underwear as part of the battle system and there are a few adult themes touched on.