I Survive by Strategizing the Ghost Teacher

18-year-old Sienna and a group of students are dragged into St. Marlo Academy. The school rules here are deadly: failing to be seated when the bell rings, not answering "here" within three seconds, lying to a teacher, or touching the teacher's desk will all get you stricken off the red roll book. Those who are stricken off not only die but also vanish from real photographs and everyone's memories.