Issei is angry he saw Rias talking to another dude and decided to leave for a bit devastating Rias 3 months pass and Issei comes back to town but finds the group split up and now he is on a mission to get everyone back together and make things right with the girl he loves (Im gonna also include Lucas in this because the name is sick and Akeno needs someone to date in this cause Issei is coming back to win Rias' heart and his time away made him want to give up) I DONT OWN ANY OF THIS