itch.io

Sorry for the late reply! 
The full name for the main girls are 

Watanabe Ai 
Amau Hana 
Ishikawa Rin 
Okusora Eri 
Izayoi Mio

I wrinkled them here and there but they mostly aren't mentioned and just some background stuff hehe 

Every sinners (except for poor old man) have regeneration. Abi can drain life force without needing contact and the old man can learn any spells he wants without restriction (He also has photographic memory) (-ω-ゞ