Osananajimi to wa Romcom ni Naranai

From K Manga:
Hero, your average high school boy, has a problem: Shio and Akari, his two female childhood friends, go to the same school as him, and they're way too cute! He's certain they don't see him as more than a friend, though, and would be mortified if they learned how he feels. Meanwhile, the girls have their own secrets. Enjoy a sweet and vexing love triangle as longtime friends struggle to be more honest with each other.