With Yachiyo in low spirits, Iroha and company leave her behind and head for the Memory Museum. Touka Satomi, a friend of Iroha’s sister, Ui, awaits them there to give them a lecture about the truth of Magical Girls. Yachiyo’s past memories give her a push, and she decides to go find Iroha. However, at that very moment Iroha is already in the midst of a "vicarious practical learning" course prepared by the Magius.
What happens if a Soul Gem becomes murky?
¿Qué pasa si la Soul Gem
se oscurece del todo?
¿Qué pasa si la Soul Gem
se oscurece del todo?
Qu’arrive-t-il quand une Soul Gem est
totalement corrompue ?
Cosa succede quando una Soul Gem 
si intorbidisce completamente?
O que acontece se a Joia da Alma
ficar completamente escura?