Markane is a 16 year old highschool student who plays way too many MMO games. Especially, his favourite game WorldEnding, one of the most popular games in the continent for it's open ended gameplay. However, when he logged in as his character, he didn't know that he'd one day be summoned to another world.... Meanwhile, cultists circle around the pentagram around the floor. Soon they would be able to summon the mighty Markanezaroth, Lord of Ruin. It was a difficult ritual, but once they succeeded, they could gain ultimate power.... This is a tale of how a mighty demon was summoned into the world and what can mere mortal heroes do in the face of the ultimate evil?