"Peter Grill" is a story about Peter becoming the strongest warrior in the country and marrying the king's daughter. The king is a psycho who wants to plant his seed inside her, and many sexy characters are sent by their clan/tribe to have s*x with Peter. The story is meant for people with a strong s*xual desire to s*x with anyone remotely sexy, as well as NTR fanatics. There is also r*pe tied to the story. The target audience is not clear, but if you are a weird person, this may be what you are looking for.
Peter Grill is a nonsense anime that promotes NTR as a good thing and tries to trick viewers into believing that all men are like Peter, greedy assholes who like to have sex. The truth is that if you genuinely love someone, you wouldn't betray them in any way. Peter's love for Luvelia and his ability to refuse any of the girls from having sex is a lie. The anime uses the "r*pe" shtick to make Peter look innocent, even when he is clearly strong enough to escape situations easily and unharmed. He even spouts random quotes or tells the audience that he still "loves" Luvelia even though he just NTR'd her.