Oyasumi Punpun (Manga) Wiki

Punpun is a relatively normal elementary school student; he goes to lessons, does his homework, and gets along well with his classmates. Unfortunately, it’s everyone else around him that’s bonkers! With a crowd of crazy teachers playing hide and seek or having extreme reactions to even the tiniest situation at school, his father kept at bay on domestic violence charges, and only his unemployed layabout uncle to look up to Punpun’s life is anything but simple. However, despite the mayhem surrounding him, Punpun still continues to quietly live on, contemplating his dreams, experiencing the joy and terror of falling in love, and trying to deal with his anxieties about sex, religion, and growing up.

Source: anime-planet