Otaku USA Magazine
Twin Star Exorcists Anime Promo Hypes Original Arc

This week saw the premiere of a Twin Star Exorcists arc that was specifically created for the anime adaptation. The Archipelago Battle for Supremacy arc introduces two original characters, including Suzu, a philosopher-like Basara played by Yūki Wakai (Leona West in PriPara, Sakamoto-san in Elite Jack!!); and Sae, a girl Rokuro and Benio take into their care played by Hitomi Sasaki. 

You can see some footage from the story in avex pictures’ latest promo for the series below. 

Source: Natalie via Anime News Network