A series of missing children incidents has occurred among the merchant families in town, but each of the children has returned in a matter of days. And yet, the client's child has been missing for a month. Kyousuke takes on the case in place of Takuboku, who's health is poor, and drags Sakutarou and Kodou into the investigation with him. While they're doing that, the client's child suddenly returns. Is this case closed? Meanwhile, the incidents involving letters of accusation thought to be finished with Tamaki's death start up again. Takuboku sets out to discover the true identity of Accuser X.
When you think of a one-year-old baby, 
what's the first thing that comes to mind?
عندما تفكّر بطفل عمره عام، ما أوّل
شيء يخطر على ذهنك؟
Was kommt dir in den Sinn,
wenn du an ein einjähriges Baby denkst?
¿Qué te viene a la mente
al pensar en un niño de un año?
¿Qué te viene a la mente
al pensar en un niño de un año?
Que te vient-il à l’esprit
quand on parle d’un bébé d’un an ?
Quando si parla di un bimbo di un anno compiuto,
a cosa si pensa innanzitutto per associazione di idee?
O que é o mais característico
de uma criança de um ano?
Когда вы думаете о годовалом ребёнке, 
что первым приходит на ум?