Some occasional mild suggestive references, but no real visual fanservice. (Amazingly, even when the characters go to the hot springs, no fanservice occurs.)
One character is accused of being a pedophile in the first episode due to his love for cute things/small children, though this is confirmed to be false.
Some occasional references to breast size in references to girls comparing who is "bigger" or "smaller".
One scene involves a girl accidentally telling a boy's sister that she "lays him out", which she misinterprets to think they are having sex. However, this is quickly cleared up.