Aragami
Aragami is also Ryuta?
Something that is implied by the end of the game, but isn't referenced explicitly in the Main page is the fact that Aragami could also be Ryuta's reincarnation? He uses Ryuta's dragon technique, shocking even Yamiko. And the speech he gives Yamiko at the end is way too heartfelt to be Ryo speaking to Yamiko; it makes a lot more sense if it is framed as Ryuta speaking. Also, the Chapter's name is "Twin Souls", which could be a reference to Aragami being actually two souls?