Yakusoku no Neverland: Senyuu-tachi no Record

After escaping from Grace Field, Emma and her friends approach the mystery of the demons and the world starting from the "Promised Forest Arc." Yugo and Lucas, Nigel and Gillian who fought with Emma against the demons, and Mujika and Sonju, who played an important role on the demon side. The story of these popular duo's respective pasts and bonds is now revealed!

(Source: Shueisha, translated)