Synopsis
A gifted young detective named Natsuki Amakusa works for the Tokyo Metropolitan Police Department. One day, he encounters Yuuya Shiki, a high school student who possesses a strange ability: he can see "marks" on murderers. After Yuuya helps solve a difficult murder case, Natsuki decides to recruit him. The two form a partnership to investigate various criminal incidents, all while working to uncover the truth behind Yuuya's hidden power.