Volume 4 of the DARLING in the FRANXX (ダーリン・イン・ザ・フランキス, Dārin In Za Furankisu) manga series was released on February 4, 2019.
List of Chapters
Squad 13 is invited to the city to receive medals and they learn about the adults’ way of life. Alpha returns with a deceased Zeta and a wounded Delta following the battle with 001. Papa orders Alpha and Delta to be pruned now that they are useless. Horrified, Squad 13 rescues them and hides them in an unused room. Despite the risks, Hachi and a reluctant Nana agree to help the squad hide the 9’s.