Zero.

Summary

In the dormitory of No. 0, a group strategizes for a mech battle competition but struggles to finalize their plan. As the preliminary rounds begin, Zero discovers he and his team are in the fifth competition zone. They learn the victory conditions involve completing an S-level mission, holding a crystal, or annihilating other teams. After battling other teams, they encounter small spiral-shaped natives living in a crystal. Zero speculates that the S-level missions may not be easily issued and questions the conditions for occupying the crystal. The group decides to approach the natives, hoping for a peaceful interaction.

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