Alive

Alive is a 2002 Japanese science fiction film directed and co-written by Ryuhei Kitamura. It is based on the manga of the same name by Tsutomu Takahashi and stars Hideo Sakaki, Ryo, Koyuki, Jun Kunimura, and Tak Sakaguchi. In the film, two death row inmates are confined to an isolation cell with an alien organism that surges the violent nature of its host. Alive was theatrically released in Japan on June 21, 2003.

Synopsis from Wikipedia, CC BY-SA 4.0. Everything below written here.

Poster © the film's rights holders.