August 2nd Part One

Sword Art Online and Darling in the FranXX Crossover. Kirito is offered to become a beta tester in a new system on the soul translator. Asuna wants to join him, but apparently she's forced to. For the game to work, a partner is required to play and for some odd reason partners have to be the opposite gender for "best experience". She's the most compatible person with Kirito, their link is exactly what's needed to pilot a FranXX.