Takeru Tenkuji is a teen who aspires to be a Ghost Hunter just like his late father. On his eighteenth birthday, he is murdered by two monsters who are part of a race known as the Gamma. He is miraculously revived, however he must gather fifteen Ghost Eyecons based on fifteen historical figures within 99 days, otherwise he will permanently cease to exist. Along his quest, he battles more of the Gamma monster race, who also seek the Eyecons for an unknown evil purpose. Takeru must defeat the Gamma and at the same time, find a way to save himself in time.