You are an awesome awesome awesome writer! I love your story! I don't know, but it encompassed all my favourite genres and defintely is the best HP fanfiction I've ever read. Totally worth the 7 hour read.
I think your story may come under the 'harem' category, though.
It's got Japanese swords, guns, armour, sci-fi and magic. All in a Hogwarts castle where Harry is one badass hero. Just.... whooo! I'm gonna die of joy.