The affinity with Ajoora will be with the release of the prologue. It will be important for the combat system because it will allow you to do more damage (you will get a nice surprise when Ajoora reaches lv 5, the max) for exploration some area and for the story because it will unlock different scenes (like good, bad end)
I want to point out that affinity can also go down depending on how you play.
Unfortunately there is still some time left until the prologue comes out... but I think it will be worth it 😉