Majestic Prince: Wings to the Future (2016)

In the latter half of 21st century, humans leave the Earth and begin to live in space. In order to adapt to the environment in space and deal with the hostile aliens in Jupiter, genetically engineered children called "Princes" are artificially raised and trained to be pilots of armed robots "AHSMB (Advanced High Standard Multipurpose Battle Device). This is a bonus epilogue episode for Majestic Prince