Chapter 0: The Devil? The God? The Dragon?

This takes place the day after the ORC were taking care of Millicas, at the beginning of volume 14. Once Issei and his friends thought they can finally relax and spend some more time together, they were soon greeted by a mysterious team calling themselves the Arcana force. Issei was given an offer to join them, to help them bring eternal peace and freedom. But can they be trusted?