Triage X Vol. 20 (manga)
As their adversary grows more aggressive, Black Label is forced to take drastic action. Bypassing the chaos of the streets above, the survivors are led through deep underground tunnels to the safety of Mochizuki Hospital-the heart of Black Label itself! Risking their organization's exposure may be the only way to save the city, but with Reika Togo's whereabouts and intentions still a mystery, the risk may be greater still...!