[5] In March 2019, Katō decided to leave the apprentice school and petitioned the JSA to become a women's professional shogi player instead.

[7] Katō, however, was unable to successfully defend her Seirei title the following year, losing a rematch against Satomi 3 games to none in the 4th Seirei Title Match (July – August 2022).

Satomi successfully defended her Women's Ōza title 3 games to 2.

[9] Katō advanced to Women's Ōza title match against Satomi for the second year in a row, but once again was unsuccessful, losing the 13th Women's Ōza title match 3 games to 1.

[10] In April – May 2024, Katō challenged Satomi (now playing under her married name "Fukuma") for the Women's Ōi [ja] title, but lost the 35th Women's Ōi Title Match 3 games to 0.