My Happy Marriage anime released the preview for episode 12 which is also the finale of the series. The final episode is titled “Light in the Darkness” with Takehiro Kubota (Sabikui Bisco episode 7) as director. Ami Sato (22/7 episodes 4, 8, and 10) is writing the script while Takao Abo (Kageki Shoujo!! episodes 8 and 12) accompanies Kubota in doing the storyboard. The finale is set to premiere on Wednesday, September 20, and will be available to stream on Netflix.
Studio Kinema Citrus (Made in Abyss) is animating the series with Evan Call (Violet Evergarden) composing the music and Shoko Yasuda (Wasteful Days of High School Girl) designing the characters. The cast includes:
The anime is based on the light novel written by Akumi Agitogi and illustrated by Tsukiho Tsukioka. The light novel was initially published on the Shosetsuka ni Naro website. Fujimi L Bunko later acquired the title in January 2019. Yen Press is licensing the novel in English and describes the plot as:
Born talentless to a noble family famous for their supernatural abilities, Miyo Saimori is forced into an existence of servitude by her abusive stepmother. When Miyo finally comes of marriageable age, though, her hopes of being whisked away to a better life crumble after she discovers her fiancé’s identity: Kiyoka Kudou, a commander apparently so cold and cruel that his previous would-be brides all fled within three days of their engagements. With no home to return to, Miyo resigns herself to her fate—and soon finds that her pale and beautiful husband-to-be is anything but the monster she expected. As they slowly open their hearts to each other, both realize the other may be their chance at finding true love and happiness.
Source: My Happy Marriage Official Website
©Akumi Agitogi, Tsukiho Tsukioka/KADOKAWA/My Happy Ｍarriage Partners