Iburi Kyoka

Iburi Kyoka
Commander of the NIDF

Spoiler warning
She was in the boat that 3511 people disappeared, the "future commander" found the "Book of the dead", the "book" gave him information, and gave him a baby (or maybe he already had it, but he made it mutate). After that event, it was discovered that some species were mutating (and the NIDF organization was created, Iburi Kyoka got to be the commander, no idea how) What follows is not very clear, it will be my own theory

Iburi said that the "Book" showed him the future, also in this episode he said "Fix the entry of Yuno to the NIDF, I manipulate his destiny". Maybe his plan was for Yuno to suspect her, causing Aiba shuu to "die" so that Yuno would finish him off with the "book of the dead" (and that the others will also be affected).