Plastination is a process used to turn biological specimens into plastic, using an unspecified technology where water and fat are replaced with polymers. This essentially turns flesh into plastic as the name suggests. It has few known uses besides preserving specimens.

Plastination yields specimens that can be touched, do not smell or decay, and even retain most properties of the original sample. Its existence is brought to light during the Specimen CaseShogo Makishima supplies plastination resin to Kozaburo Toma and Rikako Oryo, both of whom use it to turn the bodies of their murder victims into twisted works of art.