Okaa-san (10-sai) to Boku
My mother is 10 years old. ; Okaasan (10-sai) to Boku ; Okaa-san (10) to Boku.
Okaa-san (10-sai) to Boku summary: Haru-kun is a transfer student who moved into a new town with his mother. One day his mother suddenly turned into the same age as him.