The Demon Within (1985)
Original title: 餓鬼魂
The Demon Within is a 1985 Japanese-language fantasy movie directed by Masayoshi Sukita, with a running time of 54m. It stars Kazuyo Matsui, Kyōzō Nagatsuka and Ichirō Ogura.
A journalist becomes possessed by a gakidama, a spirit of the dead. Unknown to the man, a demon is now incubating in his stomach, and a mysterious stranger seem to know what afflicts him.