Farewell, hard-boiled city (Part 2)

what happens

After Ryo, Saeko, and Umibozu are able to thwart an ambush set up by Sarah, her group, the Black Army, makes a ransom demand to the Japanese government with the threat of blowing up a nuclear bomb in the heart of Shinjuku. With the information on their hideout from Rumi, Ryo decides to take the Black army on. But when he realizes the truth of Sarah's identity, he finds that he is unable to shoot her.