Fate/Kaleid Liner Prisma Illya

Illya helps out a girl named Erica after she gets stuck on the school's walls and wets herself. As the girls take a bath together, they learn that Tanaka had lost her memories just before meeting Illya. Afterwards, as Sapphire manages to get in contact with Ruby, Erica is picked up by her father, who turns out to be Darius himself.