Spoiler, click to viewAt the beginning of the story Kaine wakes up in a hospital bed with no memories of his life as Kaine, claiming that he is actually Shinogu, Kaine's twin brother. At the end, his real personality awakens, and it's revealed that he was Kaine all along but due to his trauma he suffers from dissociative identity disorder and created a second personality based on his brother's.
