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...!

Tobioka City is suffering from a long-term illness that began much earlier than its present affliction. Years ago, Miki Tsurugi was just another friendly outgoing teenager before her eyes were opened to the darkness taking hold of the city-before she met Yuuko Sagiri. Their first encounter with the city's most ruthless elements brought them within an inch of death...but not everyone was so lucky...

A new, unknown jet injector is lose in the city, sowing the seeds of chaos and death. The humans she infects turn into frothing, raving white-haired maniacs driven to torture and kill. And what's worse--anyone who comes into close contact with these monsters is liable to become one themselves. Tatara and Suzue are in trouble--will Black Label reach them in time!?

With Mikoto and Oriha still at the mercy of Syringe agents, Arashi reluctantly teams up with Chikage, and the two race to rescue their friends. So far, Chisa Yuki has maintained her innocent act in front of the other survivors, but the moment she turns bloodthirsty, Black Label won't be the only ones who suffer...

Yuuko returns to her childhood home to confront a shadow from her past. Darkness has consumed someone who was once family-and turned her into a deadly enemy. But Yuuko has forged new bonds in Black Label, and with their support, she is able to sever this last link to her past. As Syringe threatens to unleash the next stage of infection upon the city, Yuuko and the team return to the "operating theater" once more!

Mochizuki General Hospital boasts some of the most well-trained (and well-endowed) nurses in town. But though these ladies spend much of their day battling sickness, their after-hours are spent fighting a very different sort of disease...Under the leadership of the hospital chairman, a handful of staff members and local teenagers form a group of mercenary assassins, targeting the "cancers" of society and excising those individuals before their wickedness spreads.