Angel Beats is a popular anime featuring a story by Jun Maeda and character design by Na-Ga. After the release of the 13-episode series in 2010, two OVAs followed in 2010 and 2015, respectively. Nothing shows its popularity more than the many forms it has taken, including manga, light novels, and even radio shows.
The unusual story follows Yuzuru Otonashi, a boy with no memories in a school environment that works as a limbo. A girl named Yuri invites him to join the Afterlife Battlefront or SSS, an organization that fights against God and also includes the subgroups Girls Dead Monster and the Guild. Their physical enemy, however, takes the form of a silver-haired girl with supernatural powers called Angel whom Otonashi gradually befriends.