A Star Brighter than the Sun manga volume 1 features story and art by Kazune Kawahara.

Sae has always been taller and stronger than the average girl. Koki used to be smaller and weaker than the average boy. But now that he's in high school, he's tall and super popular! Will their childhood friendship rekindle… and maybe develop into something more?

Sae and Koki have been friends since childhood. One fateful day at the end of middle school, she has a revelation: Koki has grown up! Now they're in high school, and she has another revelation: she has feelings for Koki! But Sae isn't the only girl who does… The question is, who does Koki have feelings for?!