The Invisible Blade

Miezaru Yaiba (見えざる刃)

Nana wonders why Jin has not use his talent to discover the identity of the committee himself. She then tries to escape, but she is injured when Jin transforms into Moguo. Before she passes out, Nana explains her family situation. Afterwards, Nana awakens in Michiru's room where she explains to Michiru that she feels responsible for her parents' death. At the funeral for Shinji, Yūka, and Kaori, Nana notices the ill effect Michiru's talent has on her. Later, while Nana is in her room, Jin shows up. 

Shortly thereafter, Michiru shows up as well and Jin transforms into the cat. When Michiru inquires about Nana's childhood, Nana reveals that she was a typical girl who loved games and manga until the night her parents were killed by a burglar when she forgot to lock her window after she snuck out. This causes Michiru to comfort her. The next morning, Kyōya tells Nana to follow him where he shows her another dead body. Nana soon realizes that another murderer is on the loose.