Illya's enjoyable summer isn't over! After changing into a yukata, she joins the usual gang and heads to a local festival. As Illya enjoys yo-yo fishing and lottery drawings at the festival, she realizes something dire--she was supposed to wear underwear beneath her yukata! A great tragedy befalls upon her!
I think it's because they're in front of Shirou-san.
Vielleicht, weil Shirou-san da ist?
Debe ser porque están con Shirou-san.
Debe ser porque están con Shirou-san.
Peut-être parce que Shirô est là ?
Probabilmente è perché 
sono davanti a Shirou.
Acho que é porque elas estão
 na frente do Shirou-san.