Why Can’t Magical Girls Fall in Love?

"This transformation device can help you become a superhero."

"Then what's the price?"

"I'll take something from your body."

"Hah, fine! You can have my arms or my legs! If it means becoming a hero of justice, I'd even give my life!"

Five years later

"I don't want to be a superhero anymore."

"Why not?"

"You never told me you'd take that thing down there!"