Zogugu, Strange Tales of Curses

Shinichi Satsukawa was murdered and transformed into Zogugu. The murderer is Takako Ishigami, a curse-maker. Amane, the yin-yang master, sends Yuka, Shinichi's sister, to enter Shinichi's "spirit world," which remains in Shinichi's corpse, in order to find out where Ishigami is.