okay,so I saw some comments about Lucifer,saying that he gangrape Bracchi but that was actually just an illusion that Lucifer put on Bracchi as a punishment for Bracchi because he killed a lot of angels. Actually at first I hate Lucifer too but as I continue to read the story only then did I realize that Lucifer had always been in love with Bracchi but he himself didn't realize it until later on, so I recommend everyone who haven't read it to the end ,to continue reading it to know the whole truth.
To Author and Translator : Thank you for your efforts on this beautiful story and art.
Heaven Instance Dungeon: Steal the Handsome Guy's Heart