User blog comment:Xhatefate/DxD Updates~/@comment-73.46.6.122-20160903175602/@comment-24.113.252.213-20160906145647

The old guy in the illustration (I believe you called him a nurarihyon) is actually a close adviser to Yasaka and is a grandfather-like figure to Kunou? He might have not-so-good feelings about Kunou getting "close" to Issei, since he is the Red Dragon Emperor, and a well-known pervert.

But, as in all light novels, the story will end with Issei proving that he's not such a bad guy, and the old guy will give him his blessing.