Tenshi No Chi No Tanken

Tenshi No Chi No Tanken Or Angels Blood Dagger. Is about a Girl falling from heaven and being reborn as a human

But learning about the history of angels demons and humans. She learns and takes interest. In a certain angel that could take the form of a demonic

So when her family is killed by a fallen angel. She swears to defeat all demons and return fallen angels to their original state.

All with the help of her adopted sister that she found while traveling. Learning that she was a fallen angel. She was going to kill her but something told her not too

So now she travels with her sister to kill and return. In the name of Honor and justice. Will they complete her goal or become fallen angels