Saikawa and Nishinosono return to the camp, putting off trying to find a solution to the case. But they can't stop thinking about it. They go back to the lab and investigate Dr. Shiki's rooms again, where they find a strange number that is a clue.
The first was her twin brother, 
who died shortly after birth,
،الأول كان أخوها التوأم الذي مات بعد الولادة بقليل
Der Erste ist ihr kurz nach der Geburt
gestorbener Zwillingsbruder.
El primero era su hermano mellizo, 
que murió después de nacer.
El primero era su hermano mellizo, 
que murió después de nacer.
Le premier était son frère jumeau,
mort à la naissance.
Il primo era il suo fratello
gemello morto alla nascita,
A primeira delas foi baseada no irmão gêmeo
 dela que morreu logo depois de nascer,