As a child, Teppei Shimura (Taisuke Fujigaya) watched his father, a police officer, ride his white police motorcycle next to marathon runners. At that time, Teppei wanted to become a marathon runner. Later, his father was fired from his job and his father then went missing. Teppei also got injured and his life has become a mess. He is well known as a troubled kid.

After Teppei graduates from high school, he decides to become a policeman on the advice of his childhood friend Yuichi. Teppei passes his test miraculously and is accepted into a police academy.