日高(高橋一生)が逮捕された｡｢絶対に助ける｣と日高に告げた彩子(綾瀬はるか)だったが､何もできないまま河原(北村一輝)によって彼の取調べが始まる｡東(迫田孝也)と行動を共にしていた陸(柄本佑)も事情を聞かれるが､彩子のことを心配しながらも複雑な心境でいた｡連続殺人事件の主犯は誰なのか､真相にたどりつけない警察｡彩子は真実を明らかにするため､行動に出るが…｡
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.
日高正式遭到拘捕，而望月也因協助日高犯案的嫌疑被河原帶回警署；接受偵訊期間的日高堅持三宗殺人案皆自己所為，而深知日高此舉乃為了保護自己的望月則想盡辦法蒐集證據以證明真兇其實是已逝世的東朔也…
Mitsuo interroga Haruto. Sem poder ajudá-lo, Ayako precisa agir sozinha para revelar a verdade e levar justiça às vítimas.
