Just when Nana thinks she's gotten off scot-free, it's revealed that there's a necromancer in the class who can manipulate dead bodies and draw out their memories and talents.

Kyoya wants Nana to help him unmask the killer. A part of Nana wants to let the killer do her work for her, but when Michiru gets a mysterious summons, Nana has to choose between her mission and Michiru.