"Wasurenai yo" (忘れないよ, I Won't Forget) is Thelma Aoyama's seventh single, and her second in 2009.

The title is the theme song for Hachi: A Dog's Tale, which was released in Japan on August 8.

The B-side, "Don't Stop", features vocals by AI.

The CD+DVD edition of the single includes the music video for "Wasurenai yo".

On its first day on the Oricon charts the single debuted at #20, it has since peaked at #14.