is a Japanese manga series written and illustrated by Aki Akimoto. It was originally a one-shot published in Hakusensha's manga magazine LaLa in March 2020, before being serialized in the same magazine from June 2020 to June 2023. Its chapters have been collected into six volumes. An anime television series adaptation produced by Zero-G and Liber aired from October to December 2025.
Arthur, the heir to the Zetes Corporation, has become misanthropic because his jealous stepbrother Maynard constantly sends assassins after him. Marie, a destitute, stoic, and incredibly strong martial artist is hired by Arthur's butler Roy to serve him while pretending to be a robot. Marie struggles with her growing feelings towards Arthur and the stress of maintaining her lie while regularly protecting him from assassins.
Written and illustrated by Aki Akimoto, Mechanical Marie was initially a one-shot published in Hakusensha's LaLa magazine on March 24, 2020. It was later serialized in the same magazine from June 24, 2020, to June 23, 2023. Six volumes were released from December 2020 to September 2023. In February 2025, Yen Press announced that it licensed the series for English publication.
A sequel series, titled , was serialized in LaLa from April 24 to December 24, 2025. The sequel has been collected in two volumes.
An anime television series adaptation was announced on August 5, 2024. It is produced by Zero-G and Liber, and directed by Junji Nishimura, with scripts written by Mariko Kunisawa, characters designed by Yoko Kikuchi, and music composed by Yasuharu Takanashi and Johannes Nilsson. The series aired on Tokyo MX from October 5 to December 21, 2025; it was also broadcast on ytv and BS Fuji. The opening theme song is , performed by , and the ending theme song is , performed by Nao TÃ Âyama as her character Marie. Crunchyroll is streaming the series. Medialink licensed the series in Southeast Asia for streaming on Ani-One Asia's YouTube channel.