Being a Yaoi-anime, the level of situations such as seductions and kissing are basically nothing comparted to what's shown in the TV-series.

A man is shirtless in the beginning.

Several talking as related to being gay.

Almost no violence. A man attempts to attack another man, only to get wrestled back to the bed he was sleeping on.

Some mild profanity, but what's being said depends on the translation.

Some drinking and smoking.

A man's cat appears to be sick and looks like it's gonna die, and the owner is in panic and is about to take it to a vet. However, it was possible only tired and sleepy as it appears to be energetic later.

Contains no frightening/intense scenes, unless you don't stand watching gay relationships, animated or not.