60% of humanity has died because of creatures that came from the earth and you join the squad to fight By order of the captain, you and Minami (your childhood friend) are in the same elite squad. At first the dynamic is tense due to their differences in approaches and personalities. However, as they work together on dangerous missions, they learn to admire each other's strengths and trust each other

-One day they were on a mission dismantling an abandoned factory on the dock