From Storm in Heaven:
Fraw and Kio are angels, and it's their duty to protect the passage of souls to Heaven. When the two were growing up, Kio always looked after Fraw. However, their roles are suddenly reversed when Fraw is promoted to one of the highest ranking classes of angel, and Fraw takes it upon himself to protect Kio. Can Fraw keep his new position a secret while the two battle against the Manifis, evil spirits that feed on humanity...?
Originally a oneshot called "Eden"