Board Thread:General Discussion/@comment-26529154-20160209144808/@comment-28592066-20161004100639

Fun Girl is probably Megami's sister from an alternate timeline. Her father is the CEO of Saiko corp, who are behind numerous innovations and inventions. In her timeline they had one more product - This was supposed to be the biggest innovation of the century and the CEO, being the arrogant person that he is (A trait that Megami's inherited by the way) has decided that he believes in the safety of the product so much that he's willing to have one of his daughters as the first test subjects. Something obviously went wrong and now she's stuck in a limbo. She can see and sense everything but nobody can sense her.

My theorty is that she will not be a necessary part of the plot. She'll remain an easter egg. Her role will be revealed at the very end of the game and only if the player does specific things to search for her. I'm not sure what but some possibilities are befriending Oka and keeping her alive until the 10th week, then doing something with her (that will be the first time the Occult club does anything real). Ayano may also have to max out her enlightenment, bring Phantom girl to finally rest and/or do other things that regard to the supernatual.