A woman undresses in front of a man while they are in the middle of conversing. The scene is not meant to be sexual and nothing is said of it.

A girl talks about fetishes in an attempt to embarrass a boy. To no prevail, he responds with a snide quip.

The whole series surrounds a murder mystery, so of course there will be some gore when the characters are investigating.

Throughout the whole series, two bodies are shown decapitated and are generally very bloody, though nothing is ever too detailed.

Some acts of violence are shown, such as headbutting, choking, and pinning people down, though no one is every severely hurt afterwards. Later on, there are some explosions, though they are stylized and only take place for artistic choice.

Very mild language. "Damn", "hell", "piss", and "ass" are used frequently, while "shit" has only been used about three times, and "fuck" memorably once. For the most part, language isn't much of an issue. A woman calls the protagonist a "dick", though this can easily change depending on the translation.

Some name calling and terribly blunt insults are used. Parents may be wary of some of the terms used as well as the subject matter discussed, as it is a primarily dialogue-driven series.

One of the geniuses at the island is notably an alcoholic, which they are almost always seen carrying a wine bottle. Every time they give their alibi, they say they "drank the night away" with another character, and are generally shown to have hangovers in the mornings when the geniuses meet for meals.

The usual amount of surrealistic and avant-garde visuals of any SHAFT production. To top it off it was written by Nisio Isin, known for his quirky yet intelligent writing. When you mix the two, you get shows like this and Monogatari.

Many of the interactions between the protagonist and the other characters can be intense because they all analyze him as a person, psychologically, which can trigger viewers who dislike prejudice or notice some parallel lines between the dialogue and how they view themselves.

As it is a murder mystery series, the characters all suspect each other of being the murderer and are required to provide alibis. If they do not meet expectations, they are pressured to answer certain questions. This can be rather stressful to watch for sensitive viewers and children.