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Track and field hopeful Daiki grows close with Rio, a student aiming to attend university in Tokyo, until a fateful event pulls them apart.

Daiki questions Rio about her connection to the deceased Akira. Fourteen years earlier, Rio has difficulty fitting into her new family situation.

Rio tells Daiki about the night of Akira's murder. When Sanada Wellness receives a menacing threat, Rio refuses to let it get in the way of work.

Daiki asks Rio about a suspicious man and hears Kase's alibi. A slanderous article appears online and causes problems for Rio at Sanada Wellness.

Daiki tries to get information about the past from an old member of the track and field team. Faced with a difficult truth, Rio must take bold action.

Rio worries about Yu and later deals with some tough criticism. Kase notices something strange when analyzing the video of Yu and Akira's fight.

While Rio and Yu try to move forward with their lives, Shiori Tachibana relentlessly pursues answers about the Sanada Group's wrongdoing.

The discovery of a body leads Rio to give a statement to the police about the victim. As suspicions turn toward Goto, he disappears without a trace.

The police narrow their investigation thanks to the custom pen. An article appears linking the Sanada Wellness donation scandal to the recent death.

Rio must make a difficult decision as the truth comes to the surface, tying together the events of 15 years prior with the recent murders.