I'm getting very curious about this Ishitani person! I wonder: couldn't be Kaguya himself lost in the canon and time-traveled back to the mission?

And as Ishitani pointed out, the relationship between Kaguya and Momoka is a stark contrast with the one between Takara and Otegine!

A couple grammar bits:
"Momoka didn't reply, nor did she heed him; she no longer knew how to react at anything happening around her."
This phrase is usually written, "react to."

"'Look, I still can't help you find him, but there's one thing I'm positive . . .'"
This can be either "positive of" or "positive about."

—doctorlit

I enjoy your characters a lot, but it's sometimes hard to understand your missions, not knowing the canon they're from. Sorry I got to this so late, I was wrapped up in finals for a while. Mission, woo!