During the time of the Fuso Sea Incident, she was in charge of the Fuso Imperial Army's 1st Fighter Squadron. Kuroe Ayaka and the "Fuso Sea Triumvirate" - Anabuki Tomoko, Katou Takeko and Katou Keiko - were left under her command.
During the final battle, she was injured when, alongside Kitagou Fumika, she fought a navy forces battleship that wasn't following the plan and put other witches in danger. She drifted in the sea with Fumika during 3 days before being rescued. After fully recovering, she retired despite being missed by many of her subordinates and opened a coffee shop. Having learned about coffee from Katou Takeko, she went into business, running a café. With the critical success of "Flash in the Fuso Sea", and rumors that its star, Anabuki Tomoko, could often be found there, Toshiko's café became a popular stop for school-age girls. The café may or may not be located near the Akeno airfields.
Her relationship with Fumika goes back a long time, and has testified that she is "scary when mad".
A very skilled witch both in and out of combat. Toshiko has exquisite control over magic power - especially over magic shield - as her forte, and possesses a high technical strength for things like averting the fire from the Kaii with a magic shield. She can use multiple layers of shields to counter powerful blows.
- A Midnight Dream in the Desert, mentioned by Katou Keiko
- Strike Witches: The Witches of Africa - Kei's Report, Volume 1 chapter 7, mentioned by Katou Keiko
- She is based on Katou Toshio (加藤敏雄).