You are the protagonist in this story

On how many hours, 9 girls were wondering on how in hell they ended up in the church, they try to look for a way until a lots of black paper fell on top of them, they pick it up because they were curious, some girls went upstairs to check while other girls stayed downstairs. Meanwhile they saw a masked person who had a weapon and killed one of the girl, so they scream and began to retreat heading to upstairs. While everyone managed to retreat, there is one girl who slipped on the way to the stairs and begged for help, it took few minutes before they can save her, and they use chairs to lock up the way to the stair

Mika: Oh my gosh who is that?

Suzune: I want to go home!!

Akane: Hey calm down!!

Ai: We must help each other okay?

Junko: What do we do?

Rei: I don't know

Yukina: I have a bad feeling about this

Mariko: Everyone just calm down okay?

Can you save all of the remaining girls while the killer is going after them?