I'm the Demon Lord, Yet I'm Raising Beautiful Girl Heroes?!

After once again destroying a city, the strongest Demon King in history encounters the only surviving girl and takes her in as his disciple. But she turns out to be the next-generation Hero?!

Will he, as the Demon King, continue teaching her, even though she's a Hero? And after their identities are exposed, how will the two get along?

"You can't leave me until we reach the very end of hell, Master~"