Angel Beats! Spin-off!! Traveling Tenshi-chan

A 4-koma manga based on Maeda Jun's original concept of Angel Beats!

The light novel is the official prequel to the anime series.
It tells the story of how Yuri and Hinata meet, how they find out about "Angel" and the other characters and how the SSS was founded.

In a world after death, angels fight for their fate and their future. Yuri, the leader of the Shinda Sekai Sensen, rebels against the god who destined her to have an unreasonable life. On the other hand, Tenshi, the chairperson of the student council for the world after death, battles against the SSS members. SSS members utilize armed weaponry to battle it out against the angels harnessing supernatural powers.
Angel Beats! Heaven's Door is based on the the novel Angel Beats! Track Zero.

A comic featured in the booklet joined with the CD "Last Song" of Girls Dead Monster starring marina, consisiting of two short stories:
1. Last Song, Yuriko Asami
2. The 4-Koma - Bokura no Sensen Shinoukyoku ♪ (The 4コマ 僕らの戦線行進曲♪); Haruka Komowata

A dream collaboration between 23 artists and Angel Beats! Yuri! Otonashi!! This is the kind of angel you've always wanted to see!

(Source: Kadokawa, translated)

Angel Beats! -The Last Operation- will reveal why the Afterlife Battlefront members came into this world.

New Angel Beats! manga series serves as the "true arc."

(Souce: MangaUpdates)