I'm already lost where you are going with it. Is this a story or a game?

A story has to have something which a character will solve what is puzzling his mind. If he wakes up in the field without a memory of who he is, that is something to solve. If along the way of solving this case, he can meet someone either who treats him as an enemy or friendly to him that's something that will give him an idea of his identity. That's something to start with.