Stray is a prequel to CAGE. Although CAGE is Ryo's story, it involves a lot of characters who had their own tales to tell; this is where a few of the characters (particularly Maiku, Camui, and Akira) get to tell those stories.
About the Author
K. Cataldo, aka Nik. The writer, webmistress, and digital artist--in other words, the one to be blamed if anything goes wrong.