Fallen Angel is a popular Japanese anime series created by manga artist and writer Kaori Yuki. It follows the story of Atsuko Maeda, a young girl gifted with mysterious powers, and her journey to protect those she loves from an ancient evil. The show has been praised for its unique blend of action, adventure, and drama as well as its strong female characters. It has become increasingly popular over time due to its captivating story-line and impressive soundtrack composed by Yuki Kajiura.