During Chapter 7, Kohakuren takes Wil to a shrine where the head of a Kotenko who at one time must have been Kohakuen's Lover or even husband before ascending (he says that "it's the least I can do for my mate" at one point).
After reaching there, the Kotenko possesses Wil's body to speak to Kohakuren. One of the things they talk about is the growing danger of the Akuko and that their actions may be of a larger plan before the Kotenko asks Kohakuren to pass on a warning to 2 other (probably Senko like herself).
Now I've already completed the Yuela Route and Kohakuren is a requirement for the route because she is one of only 2 party members who has met Disna in person and act as mediator between him and Wil during the negotiations in currently, in the Sewari Route, since this quest about going to the shrine is on both routes, I would assume that it would also appear in the Emelita Route.
I am wondering, does this Akuko plot the Kotenko talks about get revealed in Kamidori Alchemy Meister or in any of Eushully's Games?