User blog comment:B214/Volume 22 spoilers/@comment-201.215.165.7-20170213165134/@comment-1359322-20170215070244

"Pure-blood Devils, in other words Buchou and Raiser. A pure Devil. It means their parents are also pure-blood Devils. A real Devil. Asia and I will be categorised as reincarnated Devils then."

- Volume 2

Pure-blood Devil + Pure-blood Devil = Pure-blood Devil

Pure-blood Devil + anything else =/= Pure-blood Devil

Reincarnated Devil is included in that anything else.