The spirit is eventually revealed to be Tomomi Fujimori, Ms. Likewise, the party is tasked by Philemon to find the shards of the Demon Mirror in order to free Ms. The Snow Queen then proceeds to freeze over the school and, in order to preoccupy the party until the ritual is finished, raises three towers ( Thanatos Tower, Hypnos Tower and Nemesis Tower) and appoints previous victims of the mask, Kumi Hirose, Michiko Matsudaira, and Yuriko Yamamoto, to guard them, challenging the party to best all three towers before the ritual is complete.
Saeko is then possessed by a malevolent spirit inhabiting the Snow Queen mask, who plans on sacrificing her as a way to bring about the Eternal Night. Once the route is unlocked, the protagonist should acquire the Snow Queen Mask, which is then taken by Saeko Takami.
Hermelin High School after the Mikage Hospital, but before leaving through the hole in the wall (which puts the protagonist on the main, or SEBEC, quest). The Snow Queen Quest is unlocked by performing a number of actions after returning to St.