"Mahoromatic: I'm Home!" is a two-episode OVA that serves as a continuation of the original "Mahoromatic" series. The story picks up after the events of the second season, "Mahoromatic: Something More Beautiful," and provides closure to the narrative. The protagonist, Mahoro, is a former combat android created by the Vesper organization to fight alien invaders. After retiring from combat, she becomes a maid for Suguru Misato, a young boy living alone following the death of his parents. Mahoro’s remaining operational lifespan is limited due to her energy consumption, a central theme throughout the series.

In "I'm Home!", Suguru struggles with the emotional aftermath of Mahoro’s deactivation, which occurred at the end of the second season. The OVA explores his grief and longing for her presence, as well as his attempts to move forward. Meanwhile, Mahoro’s consciousness is revealed to have been preserved within a virtual reality system, where she continues to exist in a simulated world. This virtual environment allows her to interact with Suguru and other characters, albeit in a limited capacity. The narrative alternates between Suguru’s real-world experiences and Mahoro’s virtual existence, highlighting their enduring bond despite the physical separation.

The OVA also revisits supporting characters, such as Shikijou, Mahoro’s former colleague from Vesper, and Suguru’s classmates, who provide emotional support and comic relief. The story balances moments of humor with poignant reflections on loss, memory, and the impact of technology on human relationships. The conclusion offers a bittersweet resolution, emphasizing the themes of acceptance and the enduring nature of connections formed through love and sacrifice. The OVA maintains the tone of the original series, blending science fiction, comedy, and heartfelt drama to deliver a fitting epilogue to Mahoro and Suguru’s story.