A manga adaptation illustrated by Rito Kohsaka [ja] has been serialized in Square Enix's Gangan Online service since December 2018.

In an alternative version of the Taishō era in which spirits and magic are real, but in decline, Miyo Saimori, born without supernatural talent, 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.

Written by Akumi Agitogi [ja], My Happy Marriage began publication online via the user-generated novel publishing website Shōsetsuka ni Narō.

[8] To advertise the fourth volume of the novel, three promotional videos were released on September 15, 2020, featuring the voices of Kaito Ishikawa, Reina Ueda, and Yuki Yagi as Kiyoka, Miyo and Kaya, respectively.

It was later revealed to be a television series produced by Kinema Citrus and directed by Takehiro Kubota, with supervision and storyboards handled by Takao Abo, scripts written by Ami Satō, Takahito Ōnishi and Momoka Toyoda, character designs by Shōko Yasuda [ja], and music composed by Evan Call.

[48] The thirteenth episode was bundled as an original video animation (OVA) with the special edition of the eighth light novel volume, which was released on March 15, 2024.

[53][54] Masayuki Kojima co-directed the season with Takehiro Kubota, while Ami Satō is the sole head writer and also co-wrote the script with Misato Hashiba, Fūka Ishii, and Momoka Toyoda.

[55][56] A stage play adaptation titled Watashi no Shiawase na Kekkon: Teito Rikugun Okutsuki Kitan was announced on June 9, 2023.

[65] The live-action film debuted at first at the Japanese box office during its opening weekend, earning ¥654 million through 479,700 admissions.