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Have you seen 1.0 and/or 1.11, and just not bought it? Or what?

Because it's very close to the first 6 episodes, it's not necessarily required, but there are a couple of new scenes hinting at things to come, so it's nice to know that. But still not required. (Most of it is recreated beat-for-beat.)

I haven't seen the first movie at all and, as I said, my knowledge of the series isn't exactly the best. But my local anime/manga shop has it now, so I may buy it some time.