, fully titled in Japan, is a horror seinen manga written and illustrated by Junji Ito, appearing as a serial in the weekly manga magazine Big Comic Spirits from 2001 to 2002. Shogakukan collected the chapters into two bound volumes from February to May 2002. The story revolves around a couple, Tadashi and Kaori, as they fight to survive against a mysterious horde of undead fish with metal legs powered by an odor known as the "death stench". The work also includes a pair of bonus stories, titled The Sad Tale of the Principal Post and The Enigma of Amigara Fault. Viz Media published an English-language translation of the two volumes in North America from September 2003 to March 2004 and re-released it from October 2007 to January 2008. An anime adaptation by Ufotable was released on February 15, 2012. Plot Story Gyo opens with a crew of fishermen aboard a trawler dragging up a number of strange-looking fish in the boat's net. Upon trying to inspect the unusual creatures, they discover that the strange fish seem to have legs. The fish then suddenly scuttle away, diving back into the ocean. Meanwhile, in Okinawa, Tadashi, a young man, and his longtime girlfriend Kaori arrive on the island to enjoy a scuba-diving vacation. Encountering a fish with legs, Kaori, who has a hyper-sensitive sense of smell, becomes irritated by its smell and begs Tadashi to get rid of it. He seals it in a bag, but it manages to escape. The next day, large amounts of marine life with legs invade Okinawa, including a legged great white shark which menaces the protagonists. Tadashi and Kaori manage to return to Tokyo, although Kaori becomes irritated and paranoid, claiming to smell the fish. They both encounter the bagged fish they originally encased and present it to his uncle, Doctor Koyanagi. Koyanagi reveals that the creature is the result of the Imperial Japanese Army's World War II research into a virus that causes its host to produce a deadly and repulsive stench, in a desperate effort to turn the tide of the war. His father developed a "walking machine", which pumps the virus into a host and causes the host to release the gas which powers the machine's movement; walking machines were built to carry the hosts farther, allowing them to reach and sicken enemy troops. However, during the war, enemy aircraft sunk the