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|Aliases||My darling Matilda (by Frau)|
Frau mentioned her in the drama CD The Day of Retribution, and said that she is his idol. One day when he was supposed to be doing chores in the Barsburg Church, he wanted to attend a commemoration marking the 50th anniversary of her debut, and bribed Mikage Celestine into doing the chores for him in exchange for porn. However, Castor found out and confiscated the porn, but relented and let Frau go out to meet Matilda on the condition of Frau agreeing to do the chores for the rest of the week. Frau accepted the condition and ran off to meet Matilda.