Hataraku Saibou Black Episode 12 English Subbed Episode Title:Return, the Heart, and Demise.Episode Description:AA2153 finally returns to work and resumes coaching a rookie. When they pass by the stomach, he is traumatized by remembering what happened to AC1677, but cheers up when the gastric cell remembers him and says he is glad he is all right, so he works with gusto. The blood vessels have been rupturing and filling with plaque, forcing the platelets to repair them and hindering the red blood cells. Eventually, the coronary artery is completely blocked. As the body suffers a heart attack from lack of oxygen, the brain cells announce that everyone can stop working because the body is about to die. The cells riot. While U-1196 tries to get everyone to keep working and AA2153 frantically tries to get oxygen to the heart, the heart stops and the body functions shut down.