第 13 集: 白血球調查失蹤的血球，紅血球則持續進行氧氣配送。
2018年9月30日 播出
“Confirm severity of any life threatening damages!” White Blood Cell (Neutrophil) rushes to the scene upon receiving notice of an emergency, but quickly discovers that the blood cells he has sworn to protect are nowhere to be seen. Due to the massive amounts of blood loss, a substantial number of blood cells have already been blown out through the open wound. As the blood loss continues, the situation grows increasingly dire. Despite this situation, Red Blood Cell and her new trainee are determined to continue carrying oxygen to save the world they live in and to save their colleagues. As the end of their world draws closer, what destiny awaits these cells? (Source: Aniplex USA)