The missing text on page 29, Kokoro comments that what Miko is saying sounds important and Futo tells her it's Miko's famous teachings.

It seems the version that went up was one that was between proof reads, I uploaded the corrected version here, sorry for the mistake.

Lawful wife vs. Mother of the prince's child. This could get a lot worse if it wasn't Touhou. Fortunately, this is Touhou, so everyone gets along.