Every volume. We're on the same schedule as the Japanese (though a book or two behind), that's how long it takes for him to make it.
Personally I hate reading unfinished works, this only reason this gets a pass is because I read it when it was "finished" the first time and then LO got added on. It's almost enough to make me try and forget about the series and just come back in a couple years to see how things are.
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