Yakusoku no Neverland

Synopsis

Emma, Norman and Ray re-evaluate their situation as they realize that they have been fitted with tracking devices and that Isabella and Krone suspect them. However, there is tension between the adults, and Krone covets Isabella’s position. Emma examines the new infant Carol, and discovers that the tracking devices are implanted in everyone's ears. The trio use a game of tag to train everyone's readiness to escape, which is put to the test when Krone decides to take part, catching everyone except Norman and Ray. Later that night, the trio begin to suspect that one of the other children is a spy working for Isabella.

(Source: Wikipedia)