It was a day before the disaster, our protagonist was walking around the streets suddenly he feels strange in his body then he got fell off, when he open his eyes he was not at the street.
He got reincarnate in another world with the power of shadow then we know that the name of the protagonist was Cid Kaganou.
Then we find out that the Cid have a big sister she was very good at martial art and magic , Cid doesn't knows there is magic in this new world .
One night Cid hear something in his room when he got arrived there was a monster Cid test is unpleasant power on monster then the monster turn into a women Cid was surprised to see that , Cid decided he will make a group that all people knows with Ruin of shadow.
At the Cid's house he turn lots of monster into human and let them join him to save the world from disaster.
One week later...
Now our Cid was the strongest in the world of magic when he was practicing with his big sister he won't show his true power whenever he practice he lose every time but in night protagonist show his power the name he got was from the people was Shadow.
Shadow love gold coins whenever someone stole his coins he get back coins also stole coins from the person, then one normal night they were watching from the building they saw a man is using a strange magic power he use magic to summon a demon but then shadow enters and instead kill demon in one swing, the summoner was shocked and saying 'the strongest demon that was unbeatable has been killed " then suddenly Shadow said to the summoner .
Who sent you to destroy the town he doesn't know the name of that Main mastermind then Shadow give the summoner peaceful death because he tryed to destroy the town.
Beginning to find the mastermind....