Reika had a rough start—raised without a real family and abused as a kid, she couldn't fend for herself. She ended up turning to sex work out of necessity, just trying to scrape by. Everything changed when she was twenty-three and crossed paths with Sagara Hyouma, which threw her into the Holy Grail War. During that conflict, she became the Master of Assassin, a servant of the Black faction.
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