What happens after defeating the beast and finding out he's betrayed of sorts but enters a new world from his original thanks to Ophis training him is only temporary to help him heal from the betrayal but also get stronger and make new friends and allies.

What happens when Issei's heart is betrayed by those he loved? How would he survive after the heartache? Will he go rogue, or will he advance even greater in heights not seen

Story how Issei manages to awaken not just the legendary Boosted Gear but also a unknown Sacred Gear holding another Dragon, While finding about his ancestors he eventually moves into Kouh and starts his supernatural journey and finding many companions including many so to be harem