Suzuki Aesop is a half-breed Japanese, the son of an American military officer. When his radical anti-American friends get into trouble, he finds himself running from the American MPs. Suddenly, a massive battleship appears out of the sea, flying into the air, before Aesop's disbelieving eyes. The ship comes from the 'underworld' of Byston Well, and aboard it is Princess Ryukus, who carries with her the magical winged boots, the Wings of Rean; and they are meant for Aesop...
Chris was a typical boy whose only real problem was getting into a good college; that is, until he was suddenly sucked into Byston Well, a place between Heaven and Hell. With his body stuck in Japan, his soul must now help protect the Metomeus tribe from the tyranny of the Ashigaba tribe. Armed with Garzey’s Wing – wings of light which distinguish his role as a holy warrior – Chris will do whatever it takes to protect the maiden Hassan and her people, while keeping his own body and soul intact!
Both anime share the same director and take place in the same world, Byston Well, since they are more or less based on the director's novels. Also they are both named after some legendary wings of light that have the power to summon a holy warrior, except that those wings come in the form of boots in the case of Wings of Rean. This is how the main character gets transported to Byston Well and becomes the holy warrior that will fight for peace, except that in Wings of Rean the main character gets transported after some warships from Byston Well suddenly appear in Japan. They also have the same critical flaw: a story that jumps from one scene to the next and doesn't make any sense.
Akiyuki lives on post-war Sentan Island, always rushing between the demands of his separated parents and his friends at school. But his carefree days come abruptly to an end when his school bus suffers an explosion, the first attack to plunge Sentan back into war. Akiyuki lives to find himself turned into a Xam'd, a mysterious creature, by the suspected cause of the explosion. Engulfed by Xam'd, Akiyuki is eventually saved by a red-haired girl, Nakiami, only to find himself torn away from those he loves. Now he must work to control and understand the creature within him, all while searching for his family and friends in a world steeped in the secrets and chaos of war.
Both series have princesses, weird biotech, lots of flying, and aired on the internet. More importantly, Rean and Xamd throw you headlong into the middle of a war. The disorientation is exhilarating.