Bazett's barrier was supposed to prevent surprise attacks from the dolls, however Illya finds a little girl, Erica, sneaking into their school. For some reason Erica calls Illya "Onee-chan", and the two of them quickly hit it off. Meanwhile, a man claiming to be Erica's father appears. He seems kind at first glance, and while he came to pick up Erica, he's also...?!
I... I never knew it was possible 
to have a hot spring on a roof.
No puedo creer que haya
aguas termales en la azotea.
No me puedo creer 
que haya aguas termales en la azotea.
N-Non ci credo. Delle terme sul tetto...
Eu... Eu não acredito que tem
 uma fonte termal no telhado.