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...?!
Still, I can't believe there's even 
a Noble Phantasm hot spring...
Wer hätte gedacht, dass ein
Onsen-Noble-Phantasm existiert …
Pero no puedo creer
que un Fantasma Noble genere esto.
Pero no puedo creer
que un Fantasma Noble genere esto.
Je ne savais pas qu’il existait
un artefact des sources chaudes.
Tuttavia, pensare che esistesse
uno Strumento Prezioso in forma di terme...
Ainda assim, não acredito que uma 
fonte termal seja um Fantasma Nobre...