To go off on a bit of a tangent after reading chapter 17. The author has said somewhere that he can't jump his SI somewhere he doesn't know about or has seen the anime of so when I read the line. "It wasn't Seras Victoria... This wasn't Hellsing" means he does know and has seen Hellsing. If I were a betting man I would put a bet down that this was a spot of masterful foreshadowing.
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Take Your Candle, Go Light Your World.
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Take Your Candle, Go Light Your World.