Muzan Kibutsuji, the progenitor of the demons that exist for more than 1000 years.. Put terrors upon the human being.. Full with arrogance in his life.

Becoming a perfect being was his goal, to conquer the sun... Lead him to expand his kind and conduct on many types of experiments and also to get his hands on the Blue Spider Lily, a flower that could make his dream come true.

However, one of the experiments gone wrong.. Mainly he use his demons as his 'mouse lab' but not for this one.. It doesn't show any effect when he inject the substance into his body.

As usual, during night time he would blend in the human society to seek information about the Blue Spider Lily.. While walking, he could sense that something is wrong with his body..

He walk into one of the alley, trying to figure out what is happening to him.. But before he could do anything he pass out in there..

When he regain his consciousness he try to get up, but he can't.. He try to move his body but he struggle a lot.. Confused he scream..

But he was shocked to heard a scream of a baby, it took him a few moments to realise that he have become an infant..

His scream was heard by a girl that walk past the alley. The curiosity got the best of her and she enter the alley.. She look down and was shocked to see a baby.

When she pick him up, he cry louder.. Muzan himself doesn't want to be in this condition and despise anyone who touch him.. But he can't do anything about this..