Recs if you like ハイキュー!! 1 [Haikyū!! 1]...

how to get access to many books by reading one book (series)

aka. books with the most works on ao3 about them (fandoms with 10k+ works, in no particular order) (sometimes the fanfics may be about a movie adaptation rather than the specific book but still fits in the overall fandom)

Sports stories in which at least one character goes by moniker usually preserved for royalty. I like my sports fiction as dramatic as possible, so I absolutely love that this has become somewhat of a trope in the genre. So far I have collected: three Kings, a Prince, a Queen, and a Great King. I'm always adding the volume(s) where the character with the royal nickname first appears. Recommendations encouraged!