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 years.
.خمسة عشر سنة
15 Jahre.
Quince años.
Quince años.
Quinze ans.
Quindici anni...
15 anos.