[Machine Translation] During his last spring vacation in college, Detective Kusaka used the "Seishun 18 Ticket" to travel westward on the Tokaido Honsen Line, and on the day of his departure, he learns of two train accidents. Five years later, he learns of two fatal train accidents: the hit-and-run death of a coffee shop owner near Yoshiwara Station in Shizuoka Prefecture, where Kusaka had once stopped during a trip, and the stabbing death of a man in Tokyo. Sensing a link between the incidents, Kusaka tells Inspector Totsukawa what he knows...