AkiSae

AkiSae is the slash ship between Tsukishima Akiteru and Saeko Tanaka from the anime  Haikyu!! 

Canon
Akiteru's younger brother plays volleyball on the same team as Saeko's younger brother. The two started speaking at their brother's match. However, they both attended high school together, but were in different year levels and had different interests, hence why they never properly met each other.

Fanon
Akiteru and Saeko went out for drinks together after Karasuno won against Shiratorizaw, and have been dating ever since.