The world of ants is strict and rigid. There is one purpose: preparing for the Emergence. Inside the colony, minor workers like W5 spend countless hours tunneling and taking care of the precious larvae, the Queen's offspring. There is neither day nor night.

When W5 sees the brilliant light of the sun shining through the top of a ventilation tunnel, her desire to work on the surface becomes unbearable. In this moment of desperation, her close friend X44 tells her a secret that will change her life forever.