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[Various! Haikyuu! Chars. X Reader] Hinata Shoyo (Shouyou), Karasuno's #1 decoy. We know of his younger sister, Natsu, but what about his other younger sister? Her name is Hinata (Y/N), age 15. What happens when she meets the Karasuno volleyball team? What if she becomes the second manager? How can she contribute to t...