When Ran, Sonoko, Sera, and Conan are walking, they receive a phone call from Ran's father Kogoro, who asks her not to bother cooking dinner for him as he will be gone for the night.

The Detective Boys wish to capture a few beetles to bring to school, and as a result, visit Agasa's old friend in the mountains. The Detective Boys manage to find a bunch of beetles at night, but return to find Namatame injured. Namatame's last words are "Miyama Stag Beetle" before losing consciousness.