Ben and Norah - whose relationship is floundering - tour an island in Asia called Amoi Island. While touring on a Jeep, the pair encounters group of giant
jumping spiders. One of the guides is killed and another gives them
FN FAL assault rifles, which they use to defend themselves against the swarm of spiders. During the pursuit, another tour guide is killed while Ben and Norah encounter another group of tourists fleeing a swarm of mutant
hornets and
dragonflies. Eventually, their vehicle goes off road and crashes. While the couple momentarily questions the driver, he flees the vehicle in panic as a giant
tarantula emerges behind. They manage to escape by driving the vehicle over a broken bridge, jumping over a cliff in the process. Ben pulls out his map and shows two options on where to head next: through a
cave or a
river. If the player(s) choose(s) the cave, Ben and Norah finds a rock arrangement reading "SOS," discovering the same trio of survivors from earlier. They all escape the cave by sliding down a cave waterslide, but the other tourist out of frustration with Ben and Norah, declares himself the leader, taking their guns. Before they can protest further, a rescue
helicopter is seen flying over. Ben and Norah are temporarily given
slingshots to defend themselves. Eventually, they reach an abandoned temple where the helicopter landed but find that it's full with the trio of survivors. The pilot informs them that there is another extraction point in a nearby village from which they can evacuate the island and are given their guns back. As the helicopter takes off, they are attacked by a giant
mantis. Upon killing the mantis, they discover that they're standing in front of a
Buddha shrine, to which Norah comments: "It really is mysterious Asia". If the player(s) choose(s) the river, Ben and Norah take a
canoe down the river and are attacked by giant
poisonous
tree frogs. At one point, they lose their guns in the waterfall and have to use
oars to defend themselves. Eventually, they find another pair of guns and fight a giant mutant
bullfrog. They kill the frog by shooting a tall propane tank near the frog. They also find a radio that tells anyone listening about a nearby village where they can escape via helicopter. On the third stage (which is compulsory to play on), the player(s) travel through an abandoned village, only to be attacked by more mutated jumping spiders,
fleas, giant
pillbugs, schools of
piranhas, tree frogs,
water bugs, and having to avoid drawing attention from another large purple tarantula (similar to the one seen in the first stage). They discover a young boy on his
elephant being attacked by the mutated fleas, forcing Ben and Norah to hit them off the elephant with the buttstock of their rifles. The boy then thanks them by letting them ride his elephant to the extraction point. On the way, they encounter yet the same tarantula, this time with mushrooms growing out of its back. The player injures it but does not kill it. Instead, it falls off the cliff, right into the sea. Ben and Norah make it to the temple. The boy tells a simple backstory and explains the temple was for the natives first, soldiers next, and then "good people" last. They're then interrupted by spiders and the same infected tarantula, which lunges at the player(s) from above. When the player(s) kill it, the tarantula falls into the Buddhist shrine and detonates several barrels of toxic waste in the process, resulting in the lily plant pods around the shrine to become contaminated and grow teeth. They then merge into one giant mutant plant, which the player must fight. It's eventually defeated with help from the boy, who commands his elephant to kick a propane tank at the plant, which the player must continuously shoot until it explodes and kills the plant. After the battle, the boy thanks Ben and Norah by giving Norah his good luck charm that keeps the bugs at bay. They're then rescued by another helicopter and as they fly out, several
butterflies land on the head of the Buddha statue (which is supposedly still contaminated from the barrels). While onboard, Ben and Norah learn from the helicopter pilot about the island. An environmental
NGO called "Green Leaves", came to the island after it was devastated by war. Following the motto of "bring back the green", scientists of Green Leaves discovered a species of
mushroom that possessed extraordinary biological
regenerative properties. The scientists extracted and refined the mushrooms' essence, creating a powerful chemical extract that could accelerate biological growth. In cooperation with the island's natives, Green Leaves used the extract to restore the island's fauna and flora within five years. However, it was later discovered that the extract's properties also had an unintended side effect of enlarging, mutating, and corrupting any treated organisms, turning them into large dangerous monsters, forcing the personnel and many of the natives to abandon the island, although a few decided to stay. As they rest, the two are interrupted and forced into a battle with a giant mutated butterfly and its butterfly army. Just as they come close to killing the butterfly, it launches one desperate attack that blows the two out of the helicopter, dropping their guns into the ocean and barely clinging onto a rope ladder. Without any other weapons, the two must use a slingshot and the good luck charm to deliver the final blow. If the player(s) fail to deliver the final blow, the butterfly escapes the island and the two of them will end their relationship, while a mushroom grows out of the neck of the pilot. If the player(s) successfully make the shot, the butterfly is killed and agree to give their relationship another try. The pilot being infected is omitted in this ending. ==Reception==