God Eater: The Spiral Fate

God Eater: The Spiral Fate is a manga novel that offers an alternate reality to the main continuity of the God Eater series, since the protagonist is Ryo Kagami, not Yuu Kanagi.

Trivia

 * Spiral Fate might not be considered "canon" in the manga/God Eater story continuity due to the protagonist "Ryo Kagami" conflicting with Yuu Kannagi who is the canon Burst protagonist in the GE manga continuity (Yuu appears in Summer Wars and the 2nd break). This non-canon status may be further proven as there is a manga-only fact that Sakuya discovers she expects a baby of Lindow after his "death" in the Moon in the Welkin mission. This inclusion, however, may be explained by the author's own personal inclusion of it before God Eater Burst's storyline came out. At the time there also were few or no other works concerning the name "Yuu Kannagi" or any specified protagonist of the first God Eater, thus resulting in the usage of a manga/God Eater story continuity non-canon name.
 * The female protagonist also made an appearance in chapter 3.