Mahiru's pet Kuro turns out to be a servant vampire, or servamp. Mahiru rushes back to school to find out what happened, but his friends do not remember. All Mahiru knows is that a person named Tsubaki is after Kuro...

Mahiru continues to meet new people one after another. Next, he meets a strange boy carrying a coffin at the summer festival as he tries to turn in a lost suitcase given to him by a stranger. People start to take action, each with their own reasons.

Kuro has been trapped away in a ball and the others will have to try and rescue Licht and Lawless before midnight without them. As they plan, Mahiru and Kuro head to the shop of a certain antique dealer, to find a way to get Kuro free.