Thread:Houki Minami/@comment-25201774-20170812022639/@comment-25201774-20170813203604

I was thinking of making Shirou already a Devil, killed by the person he had been tracking in relation to his lost memories. The Woman in the Mask is the one responsible for killing him and likely has all of the answers.

So he's already Rias's servant by the start of the story and has a fair amount of knowledge on how to use his Sacred Gear so far in regards to its basic abilities.