[Nvis]

Originally Posted by KiRa08o2

That's the way it goes. Same as asking why are Masou Shoujo small.

Originally Posted by Welsh_Dragon

I honestly think it is too early tell. For the underworld we only have Eu and Nene to go by for breast size. As for the Villiers we got Haruna followed by queen Lilia.

Spoiler for Theory:

Maybe the masou shojo are small like that is for the idea that their magic comes from purity?

Kyouko disagrees with you. *Rips off her shirt*