Originally posted on 4 October 2013
Source: Siren Maniacs

Siren: Hidden Message

A message hidden behind the book's cover.

Interpretation

You can assume the mentioned flower to be a Midnight Pimpernel and the item "sleeping beneath the earth", "cradled in the roots" of the flower to be the Mana medal, like in Risa's Tabori stage. The hanakotoba associated with the pimpernel is a hidden religion, and it blooms only at midnight.