Netherworld TeamA layout with Yuyuko alone as the focus - the Saigyou Ayakashi and Hakugyokurou are in the background, Yuyuko is in the foreground while Youmu is in the distance.
There are many deceased under the Saigyou Ayakashi, who put together could perhaps make up a city. Yuyuko perhaps also died under this tree and sealed it, or perhaps she was only looking for someone in this city under the tree. But either way the city has embedded itself into the trunk, tied itself to the roots, covered itself with the cherry blossoms, and become nutrients for the tree, allowing it to become youkai, but also tightly locking this youkai tree. The Ayakashi blooming is a thing of a past, and today it will not blossom again, and there will not be another city at its feet.