Invisible

Due to a former friend, Souhei—a second year in high school—is isolated in class. He does not get along with his sole remaining family, his aunt. Even the one person who understands him and whom he has secretly fallen in love with, his childhood friend Haruka, has become someone Souhei's hand can't reach. Furthermore, ever since he met a mysterious girl called Maki, his isolation in class has sped up. Souhei, who lost his place to belong, realizes that his own body is not reflected in others' eyes, and his voice can no longer reach others. He has become an invisible person...

(Source: Kadokawa, translated)