User blog comment:B214/Shin DxD 1 discussion/@comment-26709288-20180814233035/@comment-120.188.35.183-20180815051447

Wait, were you asking if Issei has mutation piece in his evil pieces set,? Evil piece among evil piece sounds weird.

I would say it's just a matter of time until it's revealed that Issei has mutation piece among his evil pieces set