User blog comment:Crimson and Darkness/Volume 24 discussion blog/@comment-30924344-20171022191120

Someone on the reddit posted a summary of the event yesterday [they are Japanese] and this is what Ishi said about this volume: "This time a story about a small cat and a black song, the secret of the birth of the two will be revealed."

So the nekomata's births apparently have something to do with a big secret that even Thanatos does not want to let Hades know about. Just a theory here, probably am going to be dead wrong but here it is. Now we know for a fact their mother was a nekoshou like them but their father we don't know if he is the same. What if Thanatos is the son of Hades and what if he's the father of them? How much of a huge plot twist would that be. We know Hades despises other species and wouldn't let any children of his even so much as breed with any other species other than a grim reaper. So Thanatos in this theory, son of Hades goes against this and has children with the nekomata sisters mother and has now decided to take action out of paranoia Hades would somehow find out which would mean death for him. I mean after all, how else would their birth be so worthy of a secret imo. Just a fun little theory.