User blog comment:Crimson and Darkness/Shin DxD 4 discussion/@comment-44928201-20200220132442/@comment-78.190.136.133-20200220151427

As long as the dragon's soul exists, it is immortal. Most likely, the spirit of Great Red will continue to live with Issei through 'Ryuteimaru'. Because actually Issei is a kind of little 'True Dragon'. Do not forget this.