I Can Travel Through the Machine War Universe at Will

My name is Beiyu, and I am an otaku. I once imagined that I could enter the world of machine warfare and have adventures. I know it's an idea, but... Why would I really enter the world of machine combat? There is an artificial intelligence that calls itself "Sai" and claims to provide me with the most comprehensive services... What the heck... I'm going to have an adventure!