Note this series was never released outside of Japan, however, it has been fan translated by some great people in the otome community.
Check out the patch releases below.
Tokimeki Memorial Girl’s Side 1 (Nintendo DS) Patch from https://sites.google.com/site/tokimemogs1/home
Tokimeki Memorial Girl’s Side 2 (Nintendo DS) Patch from https://gokusaishiki.wordpress.com/
Tokimeki Memorial Girl’s Side 3 (Sony PSP) Patch from https://sites.google.com/site/otomeundercover/otome-projects/tmgs3-psp#TOC-Patch-Download