Less of a rumour, and more that a big "PART 1 END" was at the last page of the last chapter with a
tease page along it, with it saying that it was going on break and returning when it get dark or something (like To Love Ru returning as To Love Ru Darkness), and there was the
Volume 10 afterword
But been a while since then already, and hard to track the author since it doesn't even have social media