The Promised Neverland (manga)

The Promised Neverland (Yakusoku no Nebārando, 約束のネバーランド) is a Japanese manga series written by Shirai Kaiu and illustrated by Demizu Posuka.

Plot
Emma, Norman and Ray are the brightest kids at the Grace Field House orphanage. And under the care of the woman they refer to as “Mom,” all the kids have enjoyed a comfortable life. Good food, clean clothes and the perfect environment to learn—what more could an orphan ask for? One day, though, Emma and Norman uncover the dark truth of the outside world they are forbidden from seeing.