** [[spoiler:In the game's data, complete sprite sheets for Hotori and Sayaka can be found, implying that they were meant to have a bigger part in the main story.]]
** Also, [[WordOfGod Takumi Nakazawa]] originally wanted the game to start on November 11, 2011 (making the game start on 11/11/11), but then he realized that the weather conditions in November wouldn't be good enough to trap everyone in the mountains, so he compromised on January 11, 2011 (1/11/11).
** Originally, Hotori was supposed to be the "Trickster" character, and her last name would have been "Kusuda" to reflect this (Ho-TO-RI-KU-SU-DA). However, during development, the writers didn't feel it was working out, and so transferred Hotori's Trickster aspects and last name to Yuni.
** First draft was initially planned as a deconstruction of [=Ever17=] where [[spoiler: the higher dimensional being does more harm than good even with noble intentions]].