When a seemingly emotionless android is tasked with protecting a human-hating heir, the lines between duty and genuine affection inevitably blur. Such is the premise of Mechanical Marie, the anime adaptation of Aki Akimoto’s popular manga, which continues to captivate audiences with its unique blend of romance, comedy, and action. Episode 4, which premiered on October 26, 2025, delves deeper into the evolving relationship between the titular mechanical maid, Marie, and her employer, Arthur, while intensifying the ever-present threat of assassins.
Arthur’s Illness and Marie’s Caretaking
The episode unfolds with a tender shift in dynamic after Arthur, the corporate heir, falls ill with a severe cold. His ailment is a direct consequence of protecting Marie in a previous incident where he ended up in a pond. Feeling a profound sense of responsibility, Marie takes on the role of his caretaker. This scenario forces Arthur, who typically harbors a deep distrust of humans, to exhibit a rare vulnerability, relying on Marie’s assistance.
Despite his debilitating cold, Arthur’s strong sense of duty compels him to persist with his student council responsibilities. Marie, in turn, diligently nurses him back to health, even donning a nurse’s outfit—a moment that has been highlighted by viewers as a memorable and amusing aspect of the episode. This intimate period of caretaking allows Marie to witness Arthur’s unwavering dedication firsthand, leading to a deepening of her own feelings for him.
Assassin’s Attack and Marie’s Intervention
The mansion, however, remains a dangerous place for Arthur. Even in his weakened state, an assassin makes another attempt on his life. This time, the assailant, Noah, targets Arthur during a school social function. Arthur is poisoned with a narcotic affecting both sight and hearing, leaving him highly vulnerable.
Marie swiftly intervenes, engaging the formidable Noah in a struggle. During the confrontation, Marie utilizes the emergency batteries Arthur had given her for sustenance, employing them in an unexpected manner to gain an advantage. The battle intensifies with the timely, albeit temporary, assistance of Marie 2, another robot maid, who joins Marie in fending off the villain. Marie 2, unfortunately, is decapitated in the process, though her recovery in subsequent episodes is anticipated. Marie’s quick thinking and martial arts prowess are on full display as she protects Arthur, often using unexpected items in the environment, such as a hefty vase, to neutralize the threats.
Deepening Bonds and Lingering Threats
Throughout the episode, the core romantic-comedy elements of Mechanical Marie shine through. Arthur’s reliance on Marie during his illness underscores her growing indispensability in his life, and he openly displays a vulnerable side only to her. The contrast between Arthur’s belief that Marie is a robot and her true identity as a human martial artist creates both humorous and heartfelt moments, particularly when he accepts her bizarre explanations for her “robotic” actions.
Meanwhile, Arthur’s step-brother, Maynard, and the assassin Noah are depicted making their moves from the shadows, hinting at further nefarious plots to come. Their continued machinations ensure that the delicate peace Arthur and Marie find is always precarious, keeping the tension alive for future installments.
Mechanical Marie Episode 4 adeptly balances heartfelt character development with thrilling action sequences, further solidifying the unique bond between its two main characters against a backdrop of constant danger. The episode premiered on Tokyo MX on October 26, 2025, and is available for streaming on Crunchyroll with English subtitles. New episodes of the series are scheduled to be released every Sunday.
