Yakusoku no Neverland 2nd Season

Synopsis

A flashback to the day of Norman's departure from Grace Field House shows him being handed over to Peter Ratri who oversaw experiments on humans at Lambda 7214. After Norman scored highly in all his cognitive tests, Ratri saw in him an opportunity to control the children of the Farms. Realizing his lifespan was limited, Norman devised a way to contact other inmates. He then built a bomb to destroy the facility enabling their escape. In the present, Emma, Ray, Don, and Gilda use bird migration patterns to search for Sonju and Mujika. They manage to track them down before Norman's deadline but Norman has released the drug a day early. The demons begin degenerating, causing them to rampage through the city and setting it on fire. Norman enters the city and is about to kill a demon girl when her blind grandfather calls her name, Emma. Norman hesitates, and the demon halts the child's degeneration with his blood which has the same ability as that of Mujika. As Norman wavers in his conviction to kill all demons, Emma and Ray return to the city. Emma sees an apparition of Norman as a frightened child and realizes that he still needs her help.

(Source: Wikipedia)