25c -Sono Hako wa Shoujo no Himei o Morasanai-

“...Where the hell am I...?”
My brother Yuki and I were lying unconscious in an unfamiliar room. A square room covered in tiles patterned with what looked like symbols as far as the eye could see. There were no windows in the room, only a door. There's no way I would have come here of my own free will. If that's the case, it can only mean someone forced me here.
“I remember walking around the hospital with Yuki, and then...”
Then—what happened?
I couldn't recall. It was as if that part of my memory had been completely erased.
But something was desperately urging me: ‘Get out of here.’
“Yuki, let's go together. We have to get out of here as soon as possible.”
And so, taking Yuki's hand, I started walking toward the door.