Ar Tonelico Qoga : Knell of Ar Ciel [BLES01102]

But keyboard works? I haven't tested myself but maybe you can use the mmjoystick input method with the Xbox controller. mmjoystick is for non Xinput devices, like if you were using a PS2 controller with an adapter or some generic gamgepad. But it could work with an Xbox controller too maybe.

Plan B: Map the controller to keyboard keys

Yes, keyboard works. I've tried Mmjoystick too but got the same result: all pads show as "disconnected" on the TTY window when starting the game. One time it detected the damn thing but I don't remember what I did and I couldn't get it to work again no matter what I tried.