I am the Demon King, and I vow to revitalize the Demon Clan! In the series, the

Story of: I am the Demon King, and I vow to revitalize the Demon Clan! In the series, the

[Villain + Invincible + Not the Holy Mother + Decisive Killing + No Heroine + Conquering the City + Strategy + Magic + Slight System] Many years ago, the Demon King was assassinated, and the Demon Race continued to decline... After years, the Demon King was reincarnated and reborn as the King. Return! But in today's era, other races in the world don't take the demons seriously? The terror that once belonged to the demons seems to have been forgotten in the long river of history... But on this day, as the demon king took action, mankind finally recalled the fear that was once dominated by the demons... .