TV-Series
Description
Scouted by the Taisha organization for her strong Hero aptitude, Tougou Mimori was adopted by the influential Washio family during elementary school, her birth family receiving compensation. Renamed Sumi Washio, her upbringing featured visits to Japanese monuments, instilling deep patriotism and commitment to serve the Taisha and protect Japan.

In Year 298 of the Divine Era, sixth-grader Sumi fought as a Hero alongside Nogi Sonoko and Minowa Gin against the Vertexes. Initially socially awkward and intensely traditional, she practiced misogi, led class prayers, and disapproved of Sonoko's laid-back attitude and Gin's tardiness, judging them uncommitted. Learning of their struggles—like Gin caring for siblings—forged deep friendships, making her regret her earlier superiority complex.

Sumi wielded a bow firing explosive arrows, later upgraded to the sniper rifle "Shirogane" after Gin's death. Her Mankai ability summoned a massive spaceship with eight cannons, but using it cost her the ability to walk and erased her memories of being a Hero, Gin, and Sonoko. Profoundly impacted by Gin's death, she channeled grief into combat resolve, not blaming the Taisha. Sonoko gifted her a ribbon before the final battle, which Sumi retained after memory loss.

Reverting to Tougou Mimori, she transferred to Sanshu Middle School. Her Hero memories remained fragmented, though she subconsciously kept Sonoko's ribbon. Initially using a wheelchair, her Hero form incorporated mobility aids like ribbon appendages. She later regained her memories and physical abilities following the "Hero Chapter" events.

In "Churutto!" (Year 300), she is among 27 Heroes summoned to Sanshu Middle School. Her culinary skills are highlighted as the club develops "Hero Club Udon," reflecting her established trait of cooking for family despite household staff.

Her personality blends seriousness with familial devotion: she scolds her mother's dietary choices, enjoys dressing Gin in outfits, and draws detailed battleships from memory. She avoids English loanwords and exhibits comedic patriotism, such as embarrassment over European clothing. Her chrysanthemum motif symbolizes rejuvenation and royalty, contrasting with spring-themed Heroes like Yuuki Yuuna.