If you didn't know, the nickname comes from an extra chapter, volume 16 of the Haikyū manga.The Oikawa hanger was an extra you get when you buy the Seijou jersey...
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HAIKYUU TRIVIA
Random━━ HAIKYUU TRIVIA. a book of facts and random stuff about haikyuu!! ©︎ I do not own Haikyū! or the characters, it all belongs to Haruichi Furudate