Fics like Understanding is a Three-Edged Sword

Shouyou Hinata always dreamed of becoming a pilot — a hero. In the Karasuno mobile suit team, his dream might finally come true... but as the Earth Federation and its space colonies descend into civil war, the line between friend and foe begins to blur and Karasuno are caught in the middle. To survive, they'll have uncover the truth behind a twisted conspiracy, make unlikely allies, and save the world. But first they need to put their differences aside and learn how to work together. Which is easier said than done when Hinata discovers his wingman is to be Tobio Kageyama, the most infuriating man he's ever met. (No Gundam knowledge required!)

You may also like

The Sound of Your Voice by athena_crikey (Haikyuu!!)
A little bit of sunshine by sakurachi28 (Haikyuu!!)
Trailblazer by 3ndless (Parahumans Series - Wildbow, Gundam 00, more)
The Sum of Its Parts by anonymouschupacabra (Haikyuu!!)
Colluding (and definitely not canoodling) with the enemy by aquietlife (Haikyuu!!)
Instead of Death Flag, The Villain is More Concerned About Volleyball by Alverie (Haikyuu!!)
and they said that boys were boys (but they were wrong) by flylittleswan (Haikyuu!!)
he had the world by rararatatouille (Haikyuu!!)
gonna stand by you by meregalaxiesandgods (Haikyuu!!)
I Will Follow You Into the Dark by knightswatch, shions_heart (Haikyuu!!)
Absence Makes The Heart Grow Fonder by Masonh7 (Haikyuu!!)
Pinky Promises and Fallen Stars by st0ned_pancake (Haikyuu!!, Steven Universe (Cartoon))
a portrait of infatuation (as told by kageyama tobio) by momochai (Haikyuu!!)
Until the last wave(titanic au) by Iwowkawwi (Haikyuu!!)
宿縁 : See You Soon by MissKiraBlue (Haikyuu!!)
Nice Kill!! by IndigosAbyss (Haikyuu!!, Assassination Classroom)
This is Not the End by KingsHighway (Haikyuu!!)
Shadows don't matter close to the light by boxofwonder (Haikyuu!!)
Master of None by shibioparty (Haikyuu!!)
One square forward, two squares back by cantletgangfindthisaccount (Haikyuu!!)