Friendship Can't Be Bought with Money (1) Meitantei Conan : Season 1 Episode 329

Ayumi decides that on the Detective Boys camping trip, she will attempt to address Ai Haibara by her first name and to call her "Ai-chan". During the camping trip, they run into four college students who offer them a ride in their campervan to the top mountain to watch fireworks. While driving down the mountain, one of the four college students, Yasumi Shirafuji, is found on the road dead.