Hanashi seems to have quit scanlating this, so: Avian Wander and Avian Wander React both by OGAKI Chika
Avian Wander/エビアンワンダー/Evian Wander
Action, Adventure, Fantasy, Josei, Seinen
"Frederica, the older sister. She contracts a demon, hunts the souls of the wicked, and sends them to hell. She is the silver seal.
Howly, the younger brother. He was given his life by a demon, according to his sister's wish. He serves and protects the silver seal. He is the warrior seal.
What will the world give to them...?"
Avian Wander React/エビアンワンダーＲＥＡＣＴ/Evian Wander React
Action, Adventure, Fantasy, Josei