Tsumura Mikage holds a supervisory role in the workplace of Sai Nanohana, father of Jiyuu Nanohana, during the second series. Her dynamic with Sai remains strained by his unresolved romantic attachment to her, which endures despite her marriage. In the first series, Mikage discloses critical truths to Sai regarding Jiyuu’s ties to the Yagyuu lineage and her destiny as the Lovely Eyepatch’s successor, highlighting her deep understanding of the supernatural struggles entwined with the Nanohana family.

Amid the second series’ escalating chaos driven by Freesia Yagyuu’s schemes, Mikage directly intervenes to stabilize both emotional and physical fallout. When Jiyuu suffers memory loss, erroneously identifying Mikage as her mother, Mikage orchestrates the young woman’s reunion with Ayunosuke Odagou—a pivotal ally tied to the Yagyuu legacy. Concurrently, she enlists her husband’s aid to oversee Sai’s welfare after his accidental harm to Jiyuu, showcasing her pragmatic crisis management.

Mikage further navigates tensions within the Siberian Yagyu clan, probing dangers targeting Ayunosuke and uniting allies to shield Jiyuu. Her calculated efforts peak in urging Jiyuu to embrace her identity as Yagyuu Jubei, blending tactical persuasion with empathetic resolve. Balancing professional duties and covert engagement in supernatural warfare, Mikage emerges as a composed anchor amid turmoil, methodically mitigating conflicts to preserve stability.