In 1999, a wild and strong man was killed by the monster. However he has returned to life, and has been sleeping this 10 years.. His name is Gai Shioh. Miracle GAI! When will you awaken? Now a legend begins ...

A boy abandoned at birth and raised by rats, with the mysterious power to control them, grows up seeing the dark side of the humans that rejected him and vows to become humanity's greatest enemy.

The world has become a desolate, lawless land where bandits roam free, innocent people suffer, and demons lurk around every corner. Souna Yuuki is traveling with his family when they are attacked by bandits....