Raise Magical Girls and Leave Them With Eternal Regret

“What’s the best way to defeat someone?”
“Destroy something beautiful in front of them.”
“And what if it’s a magical girl? One who possesses the power to protect everything?”
“Oh, that’s easy too,” Yuu said with a smile.
“Just become something beautiful in her heart when she knows nothing.”
“And then…”
“Di*e right in front of her.” (Leave her with eternal regret!)
After all, ‘villains’ aren’t within the ‘heroes” protection range, right?
But… it seems that the actual situation is a bit different from what Yuu had imagined?
Why, after he ‘died,’ do all these magical girls want to lock him up, one by one?
The pace is a bit off…