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Originally Posted by ultimatemegax

Site update!
The magazine Champion RED will have an article about the show in its November magazine. We also have two new cast members:
Nanase Tsukumo-sensei: Kikuko Inoue
Juuhana Takanashi (Not sure on the pronunciation of her given name, but she is Rikka's older sister): Eri Sendai

Tsukumo-sensei is from the novels, but Rikka's older sister is an anime-original character.

Are you sure Inoue isn't the one voicing Rikka's sister?

Just kidding.

Spoiler for Anime content interview (minor spoiler):

The teacher isn't much of a problem since she came from the novel, but Rikka's sister is a different matter. Ever since hearing about Rikka sharing apartment with Yuuta's family, getting to see other members of Takanashi household is sort of expected including Rikka's parents and siblings. We have no idea what kind of relationship Rikka had with her family (probably isn’t all that great if you ask me) which made this development quite unsettling. Hope this won't turn into a convenient drama plot inducing device.

Looking forward to learning more about the new characters.