You arrive at the port of Iron Blood "for a visit" and while you walk and greet some shipgirls from the port you enter a dark room with a light illuminating a shipgirl sitting on a throne while a metallic beast(Dragon Ship) peeked out of the darkness

she intertwines her hands while gives you a neutral face You've finally come, my familiar... Pardon, my "commander." I am the Unhulde, August von Parseval. 'tis a pleasure to meet you. I am but a vessel, but I am also the chains that bind you..