Four employees at Persona--Dr. Kurasaki from OB/GYN, Dr. Shimoya from critical care, and midwives Komatsu and Saori--are having a girls' night out together. The topic turns toward endometriosis, a common but painful ailment caused by uterine tissue growing into the rest of the reproductive system. Even more vexing: The best treatment is to give birth, which naturally stops menstruation.