Ok pplz I'm about to bash my head with a frying pan I've been tryin to remember the name of this anime I watch for hours now.
Anyways from what I remember the main character starts off with a Princess or sumptin she has this big ship that flys around on land but it looks like it is made of rock and has like a garden up on top, and looks like a big flying swan. Anyways this guy in a white mech with a kind of tail is forced to attack her by the bad guys. He ends up being captured and u find out he is from earth and not from the place they r at. They bad guy he ends up fighting is being controlled by a family member of the Princess like her sister or sumptin i think but she fights with the guy in the white mecha in this super ancient black mech that was like the 1st one ever made by the ancients, anyways when he fights her she looks one way but she can transform back into the appearance of the sister. I can't remember much more except the kid in the white mecha ends up buying the ship from the princess and making it his own country, plus there are these crystals in certain parts of the ship where he sneaks to mine the crystals and the girls in the anime r always mad and taking away his crystals and telling him not to dig them outta the ship. And the white mecha i remember also i think the kid got mad or someone was beating him in a fight so the white mech would like start to turn black or sumptin.