Maybe it's just me, but i think the anime failed to deliver one of Momiji's key character... I means when i watched the anime, i thought Momiji is an impulsive Goddess, who just have a
golden heart from time to time, and just conveniently there when the plot needed . But the manga clearly showed her to
very manipulative on Ichiko, as she continuously set up the stage for Ichiko's character development. She's like the mastermind of the series
Maybe that's how she gained Yamabuki-neesan trust in the first place, considering how well she did her job