Well, OK.
Honestly, I'm rather worried that Satoshi is somewhat overpowered here. He seems stronger than everyone else by some way, and he seems to be able to basically solve every problem we might have with little effort. That isn't really good for the RP as a whole, since for the RP to work we need to all have a role in the story, and there needs to be conflict etc.
I'm not saying there's anything wrong with him as a character, but for this particular scenario I am worried he's a bit too powerful. I mean, from what I can tell from talking to you he could easily defeat even Gilgamesh, let alone the other servants who are hanging around.