Dolls Code

Dolls Code (ドールズコード) is a manga written and illustrated by Kinashi Runamu.

Plot
7 teenagers who committed crimes had their body parts related to the crime they committed taken away and were sent to a school with a locked room. To return to their normal lives, they have to continuously take the examination and graduate as the first in the class within one week. Whoever wins the final exam will graduate. However, one of the contestants is a doll, created by the missing body parts of the others.