Hitsugi no Chaika

Synopsis

The female knight introduces herself as Dominica Skoda and allows the trio to stay in her mansion. Toru suggest that they ask Dominica to hand over Arthur's remains peacefully before using force if that fails, but Chaika is reluctant since Dominica saved their lives and has been kind to them. The next day, Toru asks Dominica for Arthur's remains. To their surprise, she agrees to hand them over if they can defeat her. As they prepare, the group realizes that there is something strange about Dominica since she didn't recognize Chaika, despite being one of the Eight Heroes. During their match, Toru and Akari fight Dominica in their Iron-Blood Transformation forms but are unable to overcome her. However, Toru realizes that the Dominica they are fighting is not human but rather her Dragoon taking her master's form and forces the dragon to reveal its true form. Using their skills together, Toru, Akari and Chaika are able to defeat the Dragoon. The Dragoon then reveals that Dominica died shortly after the wear ended but due to their close bond, she was unable to forget her master. As promised, the dragon, named Fredrika, gives them Arthur's eyes and decides to follow Toru, Akari and Chaika on their journey in the form of a young girl.

(Source: Wikipedia)