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 can't just ignore this girl!
Und in mir weckt sie instinktiv
den Beschützerinstinkt! 
¡No puedo dejarla sola!
¡No puedo dejarla sola!
Je ne peux pas l’abandonner,
c’est instinctif !
Non posso proprio lasciarla da sola!
Eu não posso deixar esta garota sozinha!