A Dragon's Freedom

Seeing the Trihexa's warning come to fruition, Issei decides to leave with the help of some friends he gained throughout his time and get back the time he lost, finding new love, eventually, the past comes back because they need their "weapon" or "pillar" back for a new threat. Unfortunately, it won't be that easy, they cannot just bribe him, the perverted boy is gone, if they want his help, they'll have to earn it and that is easier said than done