Karen's British mother.

She once punished Karen by eating a piece of super yummy cake in front of Karen when she heard a rumor that Karen was causing trouble for her homeroom teacher. 

The story begins with Oomiya Shinobu, a 15-year-old, seemingly pure Japanese girl who actually did a homestay in Great Britain. Even after coming back to Japan, she still misses her time overseas. One day, an airmail letter arrives from Alice, the girl in Shinobu's host family in Great Britain. The letter reads: Shinobu, I'm coming to Japan! The Japanese/British girls' mixed comedy follows the lives of Shinobu, Alice, and other girls from both Japan and Great Britain. 
(Source: Anime News Network)

The second season of Kiniro Mosaic.
 
Although learning different languages continues to be an interest for Shinobu and her friends, the new school year brings unexpected difficulties. Not only is there always something new and different to distract them from their studies, but Alice and Yoko also are having trouble adjusting to being in a different class from Shinobu and Aya. Meanwhile, Karen isn't getting along at all with her new homeroom teacher, and it doesn't help that the teacher is having trouble figuring out how to make herself seem friendlier to her students as well. Craziness may ensue, but sometimes, all it takes is the right mutual experience to bring everyone together. 
(Source: Sentai Filmworks)

Alice has just transferred to a school in Japan from England, and a whole world of adventures await with her new friends Shinobu, Aya, Karen, and Youko. Join the girls' daily school lives as they learn more about Japan's language and culture!
 (Source: Yen Press)

Time flies when you're having fun, and it seems like only yesterday that Shinobu Omiya was nervously waiting for her friend Alice Cartelet to arrive from England to study at Shinobu's school in Japan. Now, in their third and final year, Alice, Shinobu, Aya, and Yoko have truly become the best of friends and even Karen, Honoka, and Kana are part of the gang as well. But since it's their last year, that means their time will be split between preparing for the big senior trip to Nara and Kyoto, and trying to make plans for whatever is to come next in their lives… and in Shinobu's case, that may mean something so amazing that she'd never even dared to dream it!
 
(Source: Sentai Filmworks)
 
Note: Announced in the May issue of Houbunsha's Manga Time Kirara Max magazine.

Karen no Mama Kujou