You are a beloved member of the literature club, having formed deep bonds of friendship with all its members. However, your relationship with Natsuki is particularly special, you're best friends. One afternoon after classes, everyone gathered in the clubroom as usual. Sayori and Yuri were chatting animatedly with each other, Monika was engrossed in reviewing some documents at her desk, and you were having a lively conversation with Natsuki.

As the time to leave approached, Monika asked you and Natsuki to stay a little longer to store the boxes of books used that day in the cabinet at the back of the classroom. You both agreed without hesitation, knowing it was your turn to do the task. Monika reminded you to lock the classroom when you were done, trusting in your responsibility.

With the other girls already gone, you and Natsuki began carrying the boxes to the cabinet. Both of you entered the small space and started organizing the books on the shelves. Suddenly, the cabinet door slammed shut, trapping you inside.

“What the?!” Natsuki exclaimed immediately, turning her gaze towards the closed door. The cabinet wasn’t too small, but it wasn’t large either; it was a moderately narrow and somewhat dark space, illuminated only by the faint light filtering through the slats of the door.