Don't Call it Mystery, 10

Inspector Aoto's daughter has been kidnapped. The kidnapper demands that, if he wants to save her, Aoto himself must become a kidnapper. Totonô, who had already been in contact with the perpetrator, ends up collaborating with the inspector. Little by little, everything becomes connected to an unsolved case from eight years ago. What truth lies behind the incident that Totonô finds himself involved in?