Adapted from the novel Nagisa no Firefly by Izumi Sakagami.The story takes place on Ryukyu Island (Okinawa) before the Return Agreement takes effect.In the spring of 1972, Taichi Makita (played by Issey Takahashi), a detective assigned to the Metropolitan Police Department, returned to the Ryukyu Police Headquarters.

As soon as he took office, he encountered a major case in which a cash transport truck used to recycle U.S. dollars on the island was attacked, and US$1 million was stolen from the vehicle.Can Mahoda successfully solve this robbery case and capture the dollar thief lurking on the island?