What happened to Momochi's story release in Ninja Love+? They announced him on October 23, 2014. The "Childhood Friend" event began October 27. In Ninja Assassin, Natsume's in-game upcoming character release announcement was on October 27, and he was later released on November 19. I particularly doubt that Momo was meant to solely be a spin-off character of a limited-time story. However, I frankly have no idea what has been going on in the paid version of Ninja Love since the days I played it while it had three free characters available.
At the time, Ninja Love+ was still relatively active, so it left me a bit jarred that Natsume was released before Momo was. Months went by. Then over a year. What was the point of my limited-time Momo Chibi that I had to purchase? Ah, vanity.
Granted, there were undoubtedly any number of circumstances that resulted in his suppression, and it was certainly not uncommon among other free-to-play otome games under comparatively popular developers. I still find it disappointing, but something in me is still hoping and waiting. After all, Ninja Love had that anniversary event after several months of silence.