The Promised Neverland, Vol. 2 by Kaiu Shirai

After discovering the orphanage’s horrifying purpose, Emma, Norman, and Ray commit to a risky plan to save all the children: secretly gathering intelligence, testing the limits of the facility, and training the younger kids while maintaining a facade of innocence. Their covert preparations become more urgent and dangerous with the arrival of a new, ambitious caregiver whose curiosity and rivalry increase the stakes, forcing the trio to outthink the adults and ready everyone for a desperate bid for freedom.

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