Shueisha’s Shonen Jump+ web manga site published the 35th and final chapter of Iori Asaga’s Dear Sa-chan (Sacchan, Boku wa.) manga on October 7, 2020. Shueisha’s MANGA Plus service also published the final chapter in English on the same day.
MANGA Plus describes the manga as:
Dear Sa-chan, if only I’d had sex with you that time, perhaps I wouldn’t have wandered down this disastrous path. A story of true love and it’s downfall, brought to life by an unconventional protege.
Asaga launched the manga in July 2019.