Shigure Tokita’s Don’t Blush Sekime-san! manga ended in its 43rd chapter on Shueisha’s Shonen Jump+ app and website on April 26, 2022. Shueisha’s MANGA Plus service also published the final chapter of the manga in English on the same day.
The story of the manga is described as:
His girlfriend is super popular, but he’s the only one who sees her turn bright-red. A rom-com about a boy and his over-embarrassed girlfriend.
Tokita launched the first three chapters of Don’t Blush Sekime-san! simultaneously on Shueisha’s Shonen Jump+ website on January 5, 2021. MANGA Plus is publishing the manga in English digitally.
Source: ANN