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Originally Posted by Frontier
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It was nice seeing Mari and Shu together, especially if he's going to be leaving soon, and the latter proved to be pretty effective in combat as the "Invisible Blade." Mari managing a good assist was also cool, and together they'd probably make a pretty effective Battle Couple. Though I do have to wonder why Mari calls him Shu instead of his actual name  ?
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I've heard an explanation that it's a personal nickname based on how his name can be read, like how Fred can be used for Wilfred, Frederick, or another similar name. (This is not explained in the novel.)