
Quick answer — Mina Kobayashi voices Sagume in Natsume's Book of Friends Season 3, Sonoko Takasu in Toradora!, Fumi-san in Sweet Blue Flowers.
Mina Kobayashi voices Sagume (Natsume's Book of Friends Season 3), Sonoko Takasu (Toradora!), Fumi-san (Sweet Blue Flowers).
Sagume is voiced in Japanese by Mina Kobayashi.