Nobody

A man finds himself in front of a library, doesn't know who he is? How did he reach there? What past does he hold? He doesn't know what to do. Stuck in a world completely unknown to him. He soon realizes, he isn't normal and is a complete nobody to the world. Stuck with his problem, fate has a definite path for him. He has very little time and he has a world to save. It's a journey he needs to travel, he needs to cross many milestones, many ups, and downs not knowing why?
Things aren't easy, will a man be able to save his world? or will he end up putting everyone's life in danger?