Mitsuko Tondabayashi is the wife of Kenzaburo Tondabayashi and the mother of their daughter, Hinako. She is a supporting character in the series, appearing primarily in the real-world segments of the story. Like her husband, Mitsuko is a dedicated and enthusiastic otaku, with a particular fondness for isekai narratives that began during her student days. In her younger years, she even cosplayed and worked as a booth attendant at doujin events, matching her husband’s level of commitment to fandom.

When Kenzaburo is struck by a truck and his consciousness is trapped inside the otome game world as the villainess Grace Auvergne, his physical body survives but remains in a coma. Mitsuko readily accepts this extraordinary situation without denial or panic, demonstrating a pragmatic and open-minded personality. She works part-time (her specific job is not detailed, though she is indicated to be employed outside the home) while also caring for her husband’s comatose body alongside Hinako.

Mitsuko’s primary motivation is to help her husband return to the real world. She actively collaborates with Hinako to understand the game and find a way to complete it, hoping that doing so will allow Kenzaburo to wake up. In this effort, she acts as both a supportive mother and a fellow otaku, using her own knowledge of isekai tropes to guide their strategy. Her relationship with Hinako is warm and cooperative, built on shared love for both Kenzaburo and the otaku hobbies that bind the family.

Throughout the story, Mitsuko undergoes little personal transformation herself, but her steadfast acceptance of the bizarre circumstances and her unwavering support for her family underscore her role as a stabilizing force. She does not possess any magical or combat abilities, but her notable traits include her deep genre-savviness, her calmness in the face of the supernatural, and her dedication as a wife and mother. Her presence highlights the emotional stakes of Kenzaburo’s adventure and the real-world consequences of his reincarnation.