Twenty years ago, a meteor struck Earth, and the impact wiped out 30 percent of the global population.
Worse still, the meteor carried an extremely deadly virus. Most of those infected mutated into terrifying creatures with no reason, driven only to kill.
A small number of people infected by the virus did not mutate, but their genes underwent drastic changes, granting them terrifying mutant abilities.
This power can be difficult to control and may run wild at any moment. Those infected also developed multiple personalities.
The male protagonist is one of the most exceptional among them. An accident during his infection gave him mutant abilities, and he can also suppress this personality whenever he wants.
But he has no idea what kind of terrifying being this thing inside him really is. It even takes pleasure in pointing him in the right direction!
