Shoutout to Sesshomaru-Sama on FB....
Apparently we've seen the enemy before in the new YASHAHIME Trailer. In the Epilogue that was released for the Japanese Tsunami Relief Fundraisers, Shounen Jump featured Completed Anime and Manga dynasties in a final epilogue/ what are they doing now fashion.
InuYasha happened to be one of the many entities showcased.
The Manga Epilogue clocks in about six months after Kagome's full time return to the Fuedal Era which is when this first incident with the Yokai identified as a Ne-No-Kubi by Jaken within the manga. The anime trailer happens to follow the epilogue pretty religiously but the timing is off. Meaning what occurs with Root Head/ Ne-No-Kubi the Tachi and the Anime Trailer are obviously a flashback to the first incident as Rin is still young, Sango and Miroku's children are still toddlers and Kohaku hasn't aged much either when he speaks with Sesshomaru about the Yokai targeting Edo.
InuYasha and Kagome's daughter Moroha and Sesshomaru and his as of now unknown wife/mate, mother (that's as far as I'm going) to daughters Towa and Setsuna arrive a few years later. Somehow or someway the Ne-No-Kubi must regenerate or another arrives and then absorbs the powers over time from the Goshinboku and then creates all sorts of hell.
Sesshmaru-Sama from FB has found the translated version of the Japanese Manga and I've discussed with Site Mods that it's not Dokuga's best interests to post original manga to the site and I believe that to be a wise decision.
So I'm sharing a link:
mangadex.org/title/2363/inuyasha
But as soon as I'm approved for FB I will attempt to share the post on FB Dokuga.