Ep. 12: Nana seeks Kyoya's aid to save Michiru while uncovering her tragic past involving Hitomi.
Aired on December 20, 2020

Nana decides to save Michiru and asks Kyoya for assistance after her teacher suggests it. Kyoya arrives while Nana tends to Michiru, and Fuko visits that night to inquire about case developments. When Michiru wakes, the two spend time together. The next day, Jin speaks with Ryuji's killer and questions who manipulated Nana. Meanwhile, Tsuruoka informs the committee he is traveling to the island. As Kyoya investigates, Nana and Michiru play shogi. Michiru shares that she was bullied for her talent until she healed a dog, becoming friends with owner Hitomi Hosokawa. Michiru later fainted while helping at a hospital and learned Hitomi had cancer, eventually passing away. Nana becomes emotional when she is alone.
Episodes
- Ep. 8 · Nana manipulates classmates to cover up murders while Kyoya uncovers her deception
- Ep. 9 · Nana faces Jin Tachibana who admits to impersonating Michiru and reveals past island conflicts.
- Ep. 10 · Nana confronts Jin about his inaction and learns of her parents' murder.
- Ep. 11 · Kyoya reveals Ryuji Ishii's death as Fūko Sorano seeks revenge and Nana discovers Michiru's unconscious state.
- Ep. 12 · Nana seeks Kyoya's aid to save Michiru while uncovering her tragic past involving Hitomi.
- Ep. 13 · Nana faces a deadly trap while Kyoya uncovers the true identity of the killer.