A girl tries to kiss her boyfriend

Mild.

A woman confesses her love to a boy. He laughs about it because he thought she hated him.

Episode 24 has a very short kissing scene between a woman and her boyfriend.

A few college and school crushes mentioned. No sex.

A shot of a man on the floor after falling off a bridge is shown multiple times throughout the show in flashback sequences. Detailed, gory blood is show on the ground around his head.

A man is forced to sumo wrestle another man, but neither is hurt and this is meant to be comical.

A girl angrily uses "Damn it" while rushing in an elevator.

One use of "piss".

In episode 17 two teachers are smoking. This scene lasts around 30 seconds.