Mahiru decides to take a black kitty home, but soon finds out that his new pet Kuro may be trouble.

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; a person named Tsubaki is after Kuro.

Mahiru finds out that his best friend, Sakuya, is actually one of Tsubaki's subclass.

Mahiru nearly gets consumed by the power that he had asked for, but a stranger with the servamp of Envy comes to save them in the nick of time; Mahiru realises that just having power doesn't solve anything and struggles to figure out what to do next.

Mahiru 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.

Mahiru meets with another suspicious character, a visiting pianist from Austria; he comes to find that the pianist, Licht, is actually the Eve of Greed, Lawless.