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bikini_top black_rock_shooter black_rock_shooter_(character) gun litlicha sword vocaloid

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This series has interesting weaponry.
It's not a series, it's a solitary OVA. And even that is a recent addition.
Multi-barrelled multi-barrels? That's a bit absurd. I know she is usually depicted with a "BFG" but that would be like wielding a motorcycle on the end of her twiggy little arms. You can only suspend disbelief so far.