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D4 Princess Episode 12
Doris Ruridou is young princess who had just entered Teito Academy. She is also a Panzer, a person with special abilities and fights with a weapon called a "tool". Shortly after entering, her older sister shows up to teach her how to fight as a Panzer against other Panzers who challenge her. (Source: Anime News Network) Watch D4 Princess Episode 12 in English sub on 9anime.