Nana's secret is in danger of being exposed when a boy in her class is revealed to have the ability to travel into the past and rewrite history.

Nana's mission comes to a standstill when Kyoya starts to spy on her. When she discovers Michiru has healing abilities, she hatches a plan to use Michiru's talent to regain the upper hand.

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.

Between Nana's whereabouts during the mysterious murders, her suspicious behavior, and now the pile of dead bodies in the forest, Nana's classmates are starting to suspect her. She devises a scheme to cover her tracks using the pair of gyaru bullies.

Jin interrogates Nana, trying to learn more about her and the organization that sent her to the island. During these talks, the door to Nana's soul cracks open and she starts to remember things she would rather forget.

Nana's mission moves to the back burner when she has to spend the day nursing Michiru back to health. Deeply disturbed by her own behavior, Nana asks Michiru to open up about her past, hoping to gain some insight into what made her so selfless.