I am just as confused as you are guys.
This was on volume 9 of the Haruca, which by the way will be the last Haruca ever. Many of the projects the Haruca was publishing were moved to other magazines, but according to the website of the Haruca, this is the last chapter of Higan no Ishi, that’s it, no more story.
I was actually kinda hoping that if we waited enough there would be some news about Aki moving her story to other magazine but seems that it won’t be the case.
I was frankly hoping a lot more of this story but at least I am glad we could find out Kusunari’s secret.