And it's my fault, because I knew him when we were so young, that he's like this. [Kamui takes a deep breath, dropping his gaze awya from the vampire and staring down at the scars on his hands.]
Back home, everything is changing. The earth doesn't want humanity around any more because of all the damage we're doing. So the Dragons of Earth are supposed to destroy humanity. But there are Dragons of Heaven, too, and they're supposed to stop the Dragons of Earth.
[There's another long pause as Kamui debates, heavily, over whether or not to continue... but ultimately, he does. He needs to make his other self understand, before he does something irreparable.] I had to decide which group I wanted to join. I thought that was all that would happen. I-- [He cuts off suddenly, swallowing thickly, but plows ahead anyway.] I decided to try to save humanity, but when I did...
... Fuuma had always been very kind and gentle, and he always protected me and-- [His sister.] And when I decided, he changed. He stopped-- being the way he did before. [Kamui closes his eyes.] Because he had to fill in the role I didn't.
[Finally, he looks back up at the vampire, opening his eyes.] So you can't kill him. I have to figure out how to undo everything, first.