Zerbst Family Heirloom

The Zerbst family heirloom is a book owned and passed on by the Zerbst family of Germania.

Apparently summoned by Kirche von Zerbst's grandfather, it is actually an April 1975 Japanese porn magazine entitled Erotic PUNCH (エロパンチ, Ero Panchi). According to Kirche, it has the ability to stimulate the sexual desires of men; family sent it to her prior her wedding, but she does not use it as she deems it "unnecessary".

Later, upon knowing that Siesta departed to work for Count Mott, Saito Hiraga ventures to the latter's manor to negotiate her immediate release. As the noble refuses, he thinks of a compromise and orders him to retrieve the Zerbst family heirloom in exchange for her freedom. Initially unable to retrieve it from Kirche, the latter eventually gives it to the Count with the help of the other students.