Tragedy strikes when a stranger murders Emili and the trail goes cold after the other girls present at the scene of the crime -- Sae, Maki, Akiko and Yuka -- can't remember the killer's face; 15 years later, a now-adult Sae gets a surprise visitor.

Maki, now a teacher, trains in self-defense techniques to combat her overall sense of helplessness; when an attacker arrives at her school, Maki jumps into action to confront him, triggering a chain of unforeseen repercussions.

Akiko lives a reclusive life at home, but things change when her brother Koji moves back home from Tokyo with his wife and stepdaughter, Wakaba; as Akiko forms a bond with Wakaba, she notices signs of a strange relationship between the girl and Koji.

Yuka, a successful proprietor of a flower shop, feels intense jealousy of her older sister, Mayu, who marries a kindly policeman named Keita; Yuka's latent childhood trauma emerges and she concocts a plan to seduce him.

Fifteen years since the murder of her daughter, Asako continues to deal with grief and resentment; she receives a vital new clue to the identity of Emili's killer and sets out to find him, winding up in an unexpected location from her past.