Case 11: Steel Woman
Again... Spoiler alert! Read at your own risk!
Please do not assume that this is a correct translation until further notice.
Heidi, Chitose, Vivian and Nils finally enter the Labyrinth of Mist, where Nils expresses sadness towards his secluded grandmother. Vivian gets irritated at Nils' depressive behavior, telling him that she's always been alone and yet doesn't complain.
The group is then suddenly ambushed by two giant minotaurs made of the Mist. Heidi is caught by one of them, and Vivian activates her Eureka to protect her group, revealing the Sumerian Ruby, that allows her to grow blades from her body. She tells them that she had the metal embedded in her body as a young child, which made her parents abandon them because of the ugliness of her body. With this, Vivi has sacrificed everything and joined the White Joker with her powers, demonstrated by her when cutting a minotaur in a half. She then unexpectedly hears from Heidi that he found her powers beautiful, and gets embarrassed when he says that he wants to see it once again.
Read the full summary here.