From Storm in Heaven and one of their legacy groups, Bamboo Feathers:

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 he and Kio battle against the Manifis, evil spirits that feed on humanity? And what is so unusual about Kio and his wings...?

Originally a oneshot called "Eden."

From Bamboo Feathers:

Every night, strange happenings visit the residents of shared pension and cafe 'Tsukishiro'. One evening, the main character Touya saved Yuzuriha, and there's something about the mysterious beauty that makes him feel nostalgic. Yuzuriha asks him "Do you believe that there are beings from another world?"

This time from the fan-favorite Morimoto Shuu, a lovable story of random animals, strange heritages and living together!

From Storm in Heaven and one of their legacy groups, Bamboo Feathers:

In ancient China there exists an alternate dimension called Jusenkai, whose inhabitants, the Senkaijin, possess tremendous powers. One of them, YanLang, fled to Earth along with his rebel army after being defeated during his attempt to overthrow the Emperor. In order to capture the fugitives, the Emperor sent his elite soldiers to Earth after them.

LiFang has been traveling alone to find his father's murderer when he picks up a sick and injured man. That aloof man, TuoRen, turns out to be one of the imperial soldiers sent to earth to hunt and capture the Senkaijin rebels. While his comrades work in pairs, TuoRen prefers to be alone. That is, until the strangely powerful human, LiFang, decides to follow him on his quest.

Note: The volume 5 extra is an unrelated short story, "Time Lag."

From Storm in Heaven and one of their legacy groups, Bamboo Feathers:

Year 2022 A.D. At a time when anyone can travel around the world, there are more crimes occurring than ever. To protect the country from political terrorist attacks, a new Security System Garrison was created 8 years ago. To destroy this organization, terrorists have started aiming at the leaders of the Garrison, the Instructors.

Seven Instructors have already died in the line of duty, and to avoid another death, the 8th Instructor, Ishikawa Haruka, was given an assistant who would also act as his bodyguard. Iwase Motohisa, previously the Prime Minister's SP, falls in love at first sight with Ishikawa during a chance meeting, and then asks to be assigned as Ishikawa's assistant.