A mysterious incident occurs in which people suddenly suffer and take mysterious actions in the city. It was an experiment by Otonashi who attempted to carry out murder without getting his hands dirty by unknowingly firing a special ultrasonic wave. At Anchor, Kirihara and Third investigated, but it was difficult to identify the criminal. Keita, who will participate in the investigation, will form a combination with Kirihara at the suggestion of Mito.
街で人々が突然苦しみ出し、謎の行動をとる怪事件が発生。特殊な超音波を人知れず発射し、自らの手を汚さずに殺人を実行しようと企む音無による実験だった。アンカーでは桐原とサードが調査にあたるが、なかなか犯人を特定できずにいた。捜査に加わることになったケイタは、水戸の提案で桐原とコンビを組むことになり…。
