This is a Sekai robot thing. This is a story where the resurrectedSusanoo cut in half in Mt. mountain, or Christ rides the robot andthrows a longinus spear in the robot.
The main character, Nakajima Hisame, who participated inthedouujinshi convention, heads to buy a book requested by afriend,but falls on the way and is made into a momikucha andtransferredto another world.