"Elfen Lied" is a Japanese anime series based on the manga by Lynn Okamoto. It follows Lucy, a mutant known as a Diclonius, who possesses telekinetic abilities and horns on her head. After escaping from a research facility where she was subjected to cruel experiments, she undergoes a transformation into a more innocent, childlike persona called Nyuu. The story explores themes of isolation, the struggle for acceptance, and the brutality of humanity, as Lucy's violent past and her quest for connection lead to tragic consequences for those around her.

Yes, "Elfen Lied" is considered a dark anime. It explores heavy themes such as violence, discrimination, and the struggles of identity through the lens of its characters, particularly the Diclonius, a mutant species with horn-like appendages and telekinetic abilities. The anime is known for its graphic scenes of violence and emotional trauma, which contribute to its dark atmosphere. It delves into the darker aspects of human nature and the consequences of fear and hatred, making it a thought-provoking yet harrowing watch.

"Elfen Lied," an anime adaptation of Lynn Okamoto's manga, faced cancellation due to various reasons, including its controversial themes and graphic violence, which limited its appeal to a broader audience. Additionally, the production faced challenges in balancing the manga's darker elements with the expectations of the anime format. While it gained a cult following for its emotional depth and unique storytelling, the initial reception and controversies contributed to its limited continuation beyond the original 13 episodes.

Yes, "Elfen Lied" consists of only 13 episodes, which aired from July to September 2004. The series is based on the manga of the same name by Lynn Okamoto but only adapts a portion of the storyline, leaving several plot points unresolved. It is known for its graphic violence and emotional themes, focusing on the struggles of Diclonius, a mutant species with telekinetic abilities. Despite its short run, "Elfen Lied" has gained a significant following and is considered a notable work in the anime genre.