Through a video game, Ritsuka tracks down Septimal Moon, the
organization responsible for his brother’s death. Meanwhile, Soubi
fights against two units that both call themselves “Zero” and who
claim to feel no pain.
With Soubi coerced back into his relationship with Seimei and now
missing, Ritsuka becomes determined to reclaim the strange man who
changed his life from the brother he once adored. Meanwhile, Nagisa
reveals information about the past of Seven Voices Academy and the
painful origins of old loves lost.