They Get Stronger Every Time They Drain You! Retrain Five Hopeless Succubus Girls Through… SEX!?

You want me to retrain FIVE utterly hopeless succubus girls!?
The name’s Glenn Magna. I’m an S-rank adventurer who’s cleared countless high-difficulty quests—and to put it bluntly, I’m a man who’s been through a lot. Time and time again, I’ve been saddled with impossible quests under the lame excuse that "You’re the only one who can do it!" After years of being everyone’s errand boy, I finally hit my limit.

"Isn’t there an easier way to make a living...!?"

That’s when inspiration struck. Instead of being the one doing the grunt work...
"Why not become an instructor and raise a party strong enough to do it for me?"
While continuing my career as an adventurer, I started working as a guild instructor. But one day, the Guild Master handed me the most ridiculous request yet.

"Please... just do something about those girls!"

The party he assigned to me consisted entirely of succubi—and they were a complete disaster. Terrible with swords. Hopeless with magic. They’re so incompetent they’ve never even managed to clear a beginner-level quest. They’re the most spectacularly useless party of succubi anyone has ever seen.

But succubi possess one unique racial trait. By using their “Semen Absorption” ability, they can absorb highly concentrated life essence through naughty acts, dramatically boosting their individual power.
And, by an incredible stroke of luck... (or terrible luck?) I just so happen to possess an incredibly rare body overflowing with the highest possible concentration of life essence.

"Instructor Glenn's... semen... it's incredible...!"
"To think... it can become our strength...!"

Train them through SEX. Fight through SEX. Deepen their bonds through SEX.
Can this hopeless band of succubi grow into a legendary adventuring party?
The goal is simple: Raise an elite team capable of handling dangerous jobs on their own!
Until then, the legendary adventurer's hardships are far from over...

[Translated from Getchu]