Chrome Shelled Regios
鋼殻のレギオス (original)
Starring Nobuhiko Okamoto, Ayahi Takagaki, Mai Nakahara, Kisho Taniyama, Takehito Koyasu, Daisuke Sakaguchi
It's a action & adventure and animation show, and has a rating of 6.9 out of 10 from Imdb which is usually fine for this kind of show.
Watch it here
Not found streaming from Spain.