No.6: Saikai

It's been two years since Nezumi promised Shion they'd meet again and left No. 6. In this follow-up to the original story, Shion is now the chief of the Reconstruction Committee, where he worries about both the unstable political situation in the city and the mysterious assassin targeting him. Overwhelmed, he longs for Nezumi's assistance, only for Nezumi to reappear just when he's needed the most. Reunited at last, Shion vows that if Nezumi leaves again, they will be going together. But first, can the two boys build a future welcoming to all? And will they be able to find the hope amidst the traps that stand in their way?

(Source: Kodansha, translated)