Tokyo, 2055. The city is defined by war, resource collapse, and a dwindling population. In this landscape of despair, girls broadcast live streams — colorfully dressed, carefully ranked, continuously drained. Only their eyes carry any darkness. Then one girl wakes. She calls herself Ai, and she is from Vstar. She sings — for the smiles of everyone watching, in every corner of the world, through every shade of darkness — until the day the world ends.