ミナ・アマミヤ

Mina is a maid who has lost her memory. Having lived her mundane days serving at the mansion, one day she suddenly meets a person who calls her "Irregular." And from that day on, various attacking incidents will happen to her.

Whether Mina wants it or not, things go on and on, eventually leading to an incident that affects the survival of the house itself. The actions she takes during the story and the people she decides to get involved with will determine the game's ending.