Saint Beast

Saint Beast (セイント·ビースト) is a Japanese CD Drama franchise created by Arisugawa Kei. After the success of the Drama CD merchandise, anime adaptations and other media publications followed.

Seijuu Kourin Hen (聖獣降臨編)
The seal which was used to imprison the 2 fallen angels, Kirin no Judas and Houou no Luca, is broken and the two decide to get their revenge on God by getting rid of Heaven that had once been their home and creates the true paradise which is Hell. Soon, the guardian angels on Earth begin disappearing, and no one in Heaven can explain the happenings. But there is a sense of a vengeful animal spirit at work, and so the Four Saint Beasts are called upon to investigate.

The 4 Gods of Beasts attempts to rescue the guardian angels, as well as to find out what this evil animal spirit is...

Ikusen no Hiru to Yoru-hen (幾千の昼と夜 編～)
Long ago there was a war in Heaven which resulted in Judas and Luca – two of the six specially-chosen, talented and strong Saint Beasts – being cast out and imprisoned in Hell for leading the rebellion. But before that Heaven had been a peaceful place where the angels happily lived their lives. In this time, Judas, Luca, Goh, Shin, Rey and Gai are adolescent angels in Heaven who, on the day of Benediction, are made into adults by the supreme god Zeus. With each of the six having their own special abilities and new adult bodies to get used to, opportunities to meet each other arise and new friendships are formed.

Kouin Jojishi Tenshi Tan (光陰叙事詩天使譚)
A long time ago, Zeus, the great god, created a three-tier hierarchy of angels, top, middle and lower, although they were supposed to be equal. Also, Zeus appointed 6 angels as Saint Beasts who govern the animals of Earth. They were: Go, the Seiryuu; Shin, the Genbu; Rei, the Suzaku; Guy, the Byakko; Yuda, the Kirin; and Ruka, the Ho-oh. However, Kira, the shooting star, and Maya, the Fuga, didn’t attend the selection tests and left for the Earth.

The six angels fulfilled their tasks faithfully. However, because of Zeus’s increasingly tyrannical acts, they begin to mistrust him.