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.
Fifteen.
.خمسة عشر
15.
Al quince.
Al quince.
Quinze…
Quindici...
Quinze.