Haikyu!!

Haikyu!! is a sports manga series. It has been made into an anime and stage play.

Plot
Junior high school student Shōyō Hinata gains a sudden love of volleyball after seeing a national championship match on TV. Although short in stature, he becomes determined to follow in the footsteps of the championship's star player, nicknamed the "Little Giant", after seeing his plays. He creates a volleyball club and begins practicing by himself. Eventually 3 other members join the team by his last year of middle school, pushing Hinata to persuade his two friends who are in different clubs to join just for the tournament. However, they are defeated in their first tournament game after being challenged by the championship favorite team, which includes the so-called "King of the Court" Tobio Kageyama. Though Hinata's team suffers a miserable defeat, he vows to eventually surpass Kageyama and defeat him.

Fast-forward to high school, Hinata enters Karasuno High School with the hopes of joining their volleyball club. Unfortunately for him, the very person he swore to surpass appears before him as one of his new teammates. At first, Hinata and Kageyama are unable to work together, causing the team captain to kick them out of the club. The two decide to challenge the elder members of the team to a match, hoping that if they win they will prove they can work together and be allowed to rejoin. The team captain accepts the challenge, and working with another member of the team, Hinata and Kageyama win the match and are let back into the club.

By combining the genius-like qualities of Kageyama with Hinata's sheer athleticism, the duo create an invincible brand-new volleyball tactic. Their new combo allows them to get over their differences and creates a strange alliance between the two filled with fun and laughter for them and their teammates. Thus begins the Karasuno boys' volleyball team's journey to the top.

Het

 * AkiSae - the ship between Tsukishima Akiteru and Tanaka Saeko
 * AsaKiyo - the ship between Azumane Asahi and Kiyoko Shimizu
 * DaiYui - the ship between Sawamura Daichi and Yui Michimiya
 * HinaYachi - the ship between Hinata Shōyō and Yachi Hitoka
 * IwaYachi - the ship between Iwaizumi Hajime and Yachi Hitoka
 * YamaYachi - the ship between Yamaguchi Tadashi and Yachi Hitoka
 * KuroYachi - the ship between Kuroo Tetsurō and Yachi Hitoka
 * BokuYachi - the ship between Bokuto Kōtarō and Yachi Hitoka

Slash

 * AkaKen - the ship between Akaashi Keiji and Kozume Kenma
 * AoHina - the ship between Aone Takanobu and Hinata Shōyō
 * AoFuta - the ship between Aone Takanobu and Futakuchi Kenji
 * AsaDai - the ship between Azumane Asahi and Sawamura Daichi
 * AsaNoya - the ship between Azumane Asahi and Nishinoya Yū
 * BokuAka - the ship between Bokuto Kōtarō and Akaashi Keiji
 * BokuDai - the ship between Bokuto Kōtarō and Sawamura Daichi
 * BokuHina - the ship between Bokuto Kōtarō and Hinata Shōyō
 * BoKuro - the ship between Bokuto Kōtarō and Kuroo Tetsurō
 * BokuTsukki - the ship between Bokuto Kōtarō and Tsukishima Kei
 * DaiSuga - the ship between Sawamura Daichi and Sugawara Kōshi
 * DaiTsukki - the ship between Sawamura Daichi and Tsukishima Kei
 * EnnoAka - the ship between Ennoshita Chikara and Akaashi Keiji
 * EnnoFuta - the ship between Ennoshita Chikara and Futakuchi Kenji
 * EnnoNoya - the ship between Ennoshita Chikara and Nishinoya Yū
 * InuHina - the ship between Inuoka Sō and Hinata Shōyō
 * IwaDai - the ship between Iwaizumi Hajime and Sawamura Daichi
 * IwaEnno - the ship between Iwaizumi Hajime and Ennoshita Chikara
 * IwaOi - the ship between Iwaizumi Hajime and Oikawa Tōru
 * IwaSuga - the ship between Iwaizumi Hajime and Sugawara Kōshi
 * KageHina - the ship between Kageyama Tobio and Hinata Shōyō
 * KenHina - the ship between Kozume Kenma and Hinata Shōyō
 * KuniKin - the ship between Kunimi Akira and Kindaichi Yūtarō
 * KuroAka - the ship between Kuroo Tetsurō and Akaashi Keiji
 * KuroDai - the ship between Kuroo Tetsurō and Sawamura Daichi
 * Kuroken - the ship between Kuroo Tetsurō and Kozume Kenma
 * KuroSuga - the ship between Kuroo Tetsurō and Sugawara Kōshi
 * KuroTsukki - the ship between Kuroo Tetsurō and Tsukishima Kei
 * KuroYaku - the ship between Kuroo Tetsurō and Yaku Morisuke
 * Kyouhaba - the ship between Kyōtani Kentarō and Yahaba Shigeru
 * LevYaku - the ship between Haiba Lev and Morisuke Yaku
 * MatsuHana - the ship between Matsukawa Issei and Hanamaki Takahiro
 * OiDai - the ship between Oikawa Tōru and Sawamura Daichi
 * OiHina - the ship between Oikawa Tōru and Hinata Shōyō
 * OiKage - the ship between Oikawa Tōru and Kageyama Tobio
 * OiSuga - the ship between Oikawa Tōru and Sugawara Kōshi
 * SugaHina - the ship between Sugawara Kōshi and Hinata Shōyō
 * SugaNoya - the ship between Sugawara Kōshi and Nishinoya Yū
 * TanaEnno - the ship between Tanaka Ryūnosuke and Ennoshita Chikara
 * TanaNoya - the ship between Tanaka Ryūnosuke and Nishinoya Yū
 * TenSemi - the ship between Tendō Satori and Semi Eita
 * TeruDai - the ship between Terushima Yūji and Sawamura Daichi
 * TsukkiHina - the ship between Tsukishima Kei and Hinata Shōyō
 * TsukkiKage - the ship between Tsukishima Kei and Kageyama Tobio
 * TsukkiYama - the ship between Tsukishima Kei and Yamaguchi Tadashi
 * UkaTake - the ship between Ukai Keishin and Takeda Ittetsu
 * UshiDai - the ship between Ushijima Wakatoshi and Sawamura Daichi
 * UshiOi - the ship between Ushijima Wakatoshi and Oikawa Tōru
 * UshiTen - the ship between Ushijima Wakatoshi and Tendō Satori

Femslash

 * KiyoYachi - the ship between Kiyoko Shimizu and Yachi Hitoka

Poly

 * AsaDaiSuga - the ship between Azumane Asahi, Sawamura Daichi, and Sugawara Kōshi
 * BoKuroDai - the ship between Bokuto Kōtarō, Kuroo Tetsurō, and Sawamura Daichi

Fanon
The Haikyu!! fandom is very accepting of ships and ship wars (almost) never happen. No matter what you ship and how random your ship may be, as long as it's not pedophilia or other problematic tropes, it's usually supported by fans. Most ships are slash due to the anime focusing on mostly male characters. Most of the fandoms ship wars, which are often just smaller debates, however focus around KuroTsuki, TsukkiYama and KuroKen.