Angel Beats!

"Angel Beats" is set in the afterlife, where a boy named Otonashi wakes up with no memory of his past life. He finds himself enrolled in a mysterious school and soon meets Yuri, the leader of a group called the Afterlife Battlefront. She recruits him to join their fight against God. Their main adversary is the student council president, Angel, a girl with extraordinary abilities who stands in their way.