Book 1

Those who make contracts with devils gain the power to curse others to
death. Their mortal enemy: the Curse Detective Kiyoharu Saeyama, who uses traces
of the curses left on their victims to uncover the identities of these sick
killers. Let this deadly, paranormal game of psychological warfare
begin!


Book 3

A new bout begins! The contest this time? Demon tag. In other words, touch
the “demon” before their counter hits 666-or it’s game over.
But the demons are brainwashed students with murder on their minds, so one wrong
move could prove fatal. Curse-Breaker Saeyama and his assistant, Yamazaki will
have to divide and conquer if they want to beat the Contractor and save the
students...!