User blog comment:Crimson and Darkness/Shin DxD 4 discussion/@comment-78.10.210.206-20200219175634/@comment-78.190.143.241-20200219190213

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.