The story takes place in a trading city Eta'Aria. Leicester Maycraft is an item engineer belonging to an adventurer guild "Oasis". One night, he is at a party with his friends to see a meteor stream on the rooftop of a chapel.
车祸身亡的林渊，意外地穿越到了平行世界，并成为了一头自带签到系统的怪兽！在马里亚...
