Fourth in this series. Knight Bewitched 1 - 2 - Celestial Hearts - Absinthia. I don't consider my other games to be part of it.
Oh! That’s different from how I read the store pages.
The Knight Bewitched page says that the Ambrose Saga includes itself, the numerical sequel, and Celestial Hearts.
KB2‘s page confirms it’s the second game.
Celestial Hearts’ page doesn’t say its part of the Ambrose Saga, but going off of KB1‘s page, it’d be the third game.
Finding Light describes itself as the fourth entry.
Knight Eternal describes itself as the fifth entry.
Absinthia‘s page doesn’t mention it being part of the Ambrose Saga, and none of the other pages mention it.
I’m guessing you changed the intended canon at some point, but that never got reflected in the store pages.