Is a specific person responsible for the GATE in GATE: Thus the JSDF Fought There? I've had questions for the longest time on this. Why or who would create a gigantic portal between two worlds?
Explained in the manga I believe (links to the full size images):






Please tell me how to do boxes.


  The person who created the Hole was Hardy, the ones to come by and created the Gate to keep the Hole opened were the Empire's magicians.