Frau and Kio are angels, and it's their duty to protect the passage of souls to Heaven. Their roles are reversed when Frau gets promoted, leaving Kio behind, and then suddenly appears to be Kio's protector. Can the two work out their new relationship while battling off the Manifus...? (Source: Storm in Heaven)
Volume 1 starts off with chapter 0, originally a one-shot called "Eden".