I, the Demon, Train Heroic Girls

Li Wei, one of the Four Heavenly Kings of the Demon King's Army.

Like other Demon Kings, Li Wei's superior slowly "trained" a Hero into a powerful enemy.

In the end, Li Wei was betrayed by his own superior and killed at the hands of the Hero's party.

But when he woke up, he discovered that he had been reborn as a human.

Even more absurdly, he had become the Hero's childhood friend?!!

And even, even more absurdly, he had become a Hero himself???!!!

Heh heh, in that case, he'd better give his childhood friend a thorough training~~

This novel and its characters are entirely fictional. Any resemblance to actual people or events is purely coincidental. Do not imitate.