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Six Four is full of so many different forces, it's difficult to imagine what the ultimate outcome will be. Hideo Yokoyama has crafted a wonderful story with two unique mysteries. With the two mysteries he is able to give us two very different endings, both satisfying in their own ways. Pieces that seem to belong to one mystery may belong to the other. The characters aren't the particularily nuanced, but they serve their purpose for our protagonists internal development. Absolutely worth reading.