User blog comment:Jopjopjop/Volume 18 Spoilers/@comment-24098614-20141120225315/@comment-1359322-20141120225725

Should i shoot you or should i just hand a gun for you to shoot yourself.

"Yaegaki Masaomi - The resurrected "Avenger" who uses the Kusanagi. He was originally affiliated with the Church but was killed by them for falling in love with the previous Devil that governed the Kuou Town. The woman was from the House of Belial and she was the Champion's cousin. She was killed by the member of House of Bael."

- Spoiler from above

This was mentioned above, now you tell me which faction is he affiliated with.