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.

[2] Tadashi, a young man, and his longtime girlfriend Kaori arrive on the island to enjoy a scuba-diving vacation in Okinawa.

He reveals that he was examining the machine in detail, it used a series of spikes and tubes to latch onto his arm, forcing him to amputate it.

Soon, Kaori and Tadashi discover that hordes of marine life with legs are in the process of overrunning Tokyo, having gradually invaded the Kantō region.

During the uproar, Koyanagi manages to capture Ms. Yoshiyama and fly away while large groups of walking machines attack Kaori, and Tadashi becomes lost in his attempt to save her.

He continues to search for her when he notices the circus troupe attack Koyanagi's airship, which deploys a set of wings and escapes.

Tadashi encounters a group of students from Kyoto University, who explain that they are immune and that the virus created the walking machines after synthesizing them from shipwrecks.

In horror, the three find the father, who has somehow gotten stuck underneath a huge pillar, one of several that support the house, crushing his body.

The mother tries in vain to save her husband but he warns that the pillar that traps him is the principal post of the house; if it is moved, the building will collapse.

A huge earthquake has struck an unnamed prefecture, leaving a fault to be discovered by the people on the Amigara mountain (阿弥 ami is a name element derived from Amida Buddha, and 殻 gara means "husk").

Owaki dismisses the idea, stating it to be ridiculous, but another hiker, Nakagaki, overhearing their conversation and siding with Yoshida, claims he has found his own hole.

Another man claims a hole is made for him, and disappears into it in a panic, leading to an outburst in which several other people descend into the mountain, much to the horror of the scientists and rescue team, who flee the scene.

Owaki enters the hole and after some time moving forward in it, he can feel his neck and limbs being tortuously stretched and distorted, but he remains alive and in agony.

In his words, the inspiration came from Steven Spielberg's Jaws: "He masterfully captured the essence of fear in the form of a man-eating shark.

[17] For the first volume, Carl Kimlinger of Anime News Network praised the art and the bizarre relationship that Tadashi and Kaori share.

[19] Ken Haley of PopCultureShock gave it a B+ praising the silly moments the manga had and how they resembled that of an action/horror story normally seen in theaters.

[20] Michael Aronson of Manga Life gave it an A, echoing similar praise regarding story stating, "Logic holes and an absurd concept be damned, this is still an utterly compelling read that's sure to squeeze at one's stomach a few times.

"[21] Greg McElhatton of Read About Comics noted Ito's art skill as keeping the story from becoming "silly".