The "Nest" organization was originally a killer training organization. It collected war orphans and abandoned children from all over the world, and trained humanoid weapons through cruel cage selection. Until one day, the world changed, and some kind of abnormal existence that should not exist in the world appeared out of thin air in a certain city, causing mass casualties. After initial attempts at military intervention failed, governments of various countries began to create strange processing agencies, cultivate awakened warriors, eliminate strange invasions, contain out-of-control abnormal objects, etc.
