[Machine Translation] The "House" is a supernatural disaster that turns the inside of a building into an alien world overrun with monsters and leads people to their deaths. The "Soldier Maids" are the only girls who can fight this phenomenon with their special powers. Sion, a member of the Soldier Maids, is suddenly appointed captain of a new unit. The only one assigned to her is Iris, a shy and unreliable rookie death squad member. Zion is filled with doubt and dissatisfaction, but in the "House" Iris is a different person...? As Iris and Zion fulfill their missions together, the once solitary Zion gradually begins to trust Iris as a partner. On the other hand, Iris seems to open her heart and then close it. It seems that she is hiding a big secret.