Yoshida decides to try eating the mushrooms. One night, as Kasai is raiding the food stores, he is attacked by a grotesque-looking man who promptly disappears after encountering the group. Suddenly, Yoshida's behavior begins to grow erratic, leading him to be locked inside Kasai's room right after he pulls a gun on the group. Naoyuki decides that in order to survive, the team must leave the island. The others disagree, leading him to depart on his own. Mami frees Yoshida and they attempt to take over the ship, shooting and killing Senzō in the process. Murai and Akiko manage to take control from the two and force them off the ship. Murai finds the yacht adrift and swims out towards it. He finds Naoyuki missing and a note left behind explaining that he is responsible for the deaths of his group and had jumped overboard. On the ship, Kasai is confronted by Mami, who entices him to follow her into the forest. Perpetual rainfall has caused wild fungal growth, and Kasai realizes that those who have been eating the mushrooms have turned into humanoid mushroom creatures themselves. The mushrooms are addictive and cannot be resisted after the first bite. Kasai is last seen collapsing as mushroom creatures begin to swarm him. Others who have turned into mushroom creatures attack Akiko and Murai. They are separated and Akiko is kidnapped. As Murai tracks her down, he discovers that she has been fed mushrooms and is under their influence along with Mami, Yoshida, and Kasai. Murai attempts to rescue Akiko, but he is overwhelmed by the mushroom creatures and flees without her, making his way onto the yacht and escaping the island. Several days pass later, Murai is finally rescued. As he waits in the hospital, he begins to wonder if he should have stayed with Akiko on the island. His face is revealed to show signs of being infected with fungal growths. Murai states after that it did not matter whether he stayed or not, but he would have been happier there with Akiko. The screen fades as Murai notes that humans are not much different from the mushroom creatures. Cast Production Writing The film was based on a story in S-F Magazine which Masami Fukushima was an editor of. A treatment was written on the film by Shinichi Hoshi and Fukushima which was then made into a screenplay by Takeshi