One Halloween night, Hanji Zoe was planning a Halloween party at Attack on Titan Bar where Levi Ackerman works during the night time. Hanji wrote down names to invited and the names are, Erwin Smith, Eren Jaeger, Armin Arlert, and Mikasa Ackerman, Mike Zakarius, Petra Ral, and Jean Kirstein, Marco Bodt to the Halloween party.

      A couple weeks before Halloween, Hanji went to Erwin’s house ask him to help with the Halloween party at the Attack on titans bar because she wants to surprise everyone with a Halloween party.