Show features a mild romance between a fifteen year old girl and a fairy who is over a century old (fairies age differently than humans. He appears roughly the same age as her, but he acts more mature).
Two instances where fairies appear naked, but their bodies are completely non detailed. One fairy is an adult woman in appearance, but sensitive areas are covered by her long hair.
There's mentions of people having "companion" fairies, hinting that some may be enslaved for sexual reasons. This is never stated within the show or explained, but a fairy fears that his friend will be forced to do "sordid" things (this never happens).