This is a charming retelling of the events of Angel Beats!, bordering on being an outright parody. As such, it follows the anime rather closely, except when it decides to derail from the main plotline to further expand side-characters that weren't given much development in the anime (for example, we see here that Sekine is very mischievous and loves pulling pranks, whereas Irie is easily frightened, even of ghost stories despite being dead!) which is a definite plus. The anime is half-comedy, half-drama, but this manga focuses on the comedy and it works well in the comedic 4koma format!
The art is chibi and cute, nothing
we haven't seen before, but it suits the tone of this manga.
It's cute and enjoyable, recommended for Angel Beats! anime fans, but not for someone just getting into Angel Beats! Newcomers are advised to watch the anime first, to get the jokes and understand the whole story; then, they'll be able to appreciate the parody more.