Zenji-kun Okarishimasu

Zenji is a high school student who lives with his baseball-loving grandfather after both his parents passed away. He has a special skill: he can tell if there's anything wrong with a person's body just by looking at their face. One of his favourite daily routine is secretly watching over his classmate, Hanaoka, the hero of his school's baseball club who also sits in front of him, while he sleeps in class. One day, an unexpected incident caused them to have a direct point of contact and...!?

(Source: Hakusensha, translated)