The Diary of a Naughty Monster Girl’s Transformation

“My entire life, I’ve walked on thin ice, kept my vows, and stayed pure. I’ve never broken my oath!”

“…You’re asking about them?”

“Sigh, come on! What does a paladin’s business have to do with breaking vows?”

“Besides, monster girls aren’t even human!”

Herbert has been reincarnated.

Good news: he’s a paladin.

Bad news: he swore a “Vow of Purity” and must remain chaste for life!

Great. His new life starts with a magical c*astity ring slapped on him. What a way to kick things off!

And if that weren’t enough, he’s been assigned to a prison, tasked with “reforming and rehabilitating” the most fearsome and terrifying non-human prisoners.

A crazed dragon, a fallen angel, a dark elf, a siren, a demon, a devil… Reform them? Seriously?

Weak and helpless, Herbert doesn’t stand a chance against these monster girls and can only huddle in a corner, trembling in fear.

Just as Herbert resigns himself to a lifetime of celibacy and gloom in this prison, a certain dark god forcibly grants him a blessing, bestowing him with a special charm that irresistibly captivates all monster girls.

And then… things start taking a bizarre turn.

When Herbert steps into the prison again, he finds that the monster girls who once glared at him with hostility now gaze at him with… hunger!?

It’s at this moment that Herbert suddenly realizes—they might not be as terrifying as they appear. In fact, they might be quite worth reforming!