Hideo, Ayako’s police buddy, figures out that her soul has been switched with Haruto’s. Ayako, in desperation, seeks Hideo’s help in stopping Haruto from killing again. Meanwhile, she learns of an ancient legend about the sun and the moon, and she heads to Amami Oshima island in search of a flower that she hopes can restore her soul to her own body. There, she finds an unexpected clue concerning Haruto.

Suspecting an old love letter in Haruto’s possession holds a clue to solving the case, Ayako investigates his past to find out who sent it. Meanwhile, Hideo is approached by a man arrested for gambling who wants to make a plea bargain in exchange for information. According to him, the timings of the murders all share something in common.

After falling from an overpass, the state of Ayako’s and Haruto’s souls remains in doubt… Meanwhile, police close in on Haruto and his fraternal twin, Sakuya, as the prime suspects in the case. At that very moment, however, Sakuya is on his way to a remote island with Ayako’s roommate, Riku.

Haruto is arrested. Despite her promise to save him, Ayako can only stand by helplessly while Mitsuo begins his interrogation. Riku is also questioned by police after returning from his trip with Sakuya. Though worried about Ayako, Riku is conflicted about what he should do. With the police no closer to determining the serial killer’s identity, Ayako realizes she must take matters into her own hands.