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The Great Hinamizawa Disaster (雛見沢大災害, Hinamizawa Daisaigai) or GHD refers to the tragedy that ultimately destroys all of Hinamizawa in most of the arcs. This disaster always occurs if Rika has been killed by Takano's hands, and is first recounted in Tatarigoroshi-hen. Note that in arcs where Rika is killed by Shion (such as Watanagashi-hen) that the disaster does not occur.

The Official Story Edit

The official version of the events, as per the reports of members of the Japan Special Defense Forces (JSDF) as follows. In the early morning following the hostage situation in Tsumihoroboshi-hen, volcanic gas composed of hydrogen sulfide and carbon dioxide was released from Onigafuchi Swamp. The gas spread through the village, killing everyone while they slept. The JSDF removed the bodies, quarantined the area for almost 20 years, and covered Onigafuchi Swamp with thick concrete. Prior to the disaster, Irie Kyōsuke committed suicide by poison while Furude Rika was found to have been a victim of murder.

Popular Theories Edit

In the aftermath of the disaster a number of theories began popping up online. The popular theory is one of a government conspiracy covering up an alien bio-terrorist attack. They cite multiple points to support this theory: First of all, experts say that filling the swamp with concrete was a pointless act, as it did no good against the gas. Additionally, hydrogen sulfide should have corroded metal and caused significant environmental damage in the town, but there was no evidence of this. The SDF soldiers who worked in the area after the disaster received frequent blood tests, which the conspiracy theorists think give evidence that they were testing some sort of bacteria on humans.

The primary support for the alien theory comes from Document No. 34 and the words of Ryūgū Rena from the night prior to the incident.

Truth Edit

The deaths of Tomitake Jirō, Irie Kyōsuke, Furude Rika and the entire village were ultimately part of a plot by Takano Miyo to validate the theories of her adopted grandfather Takano Hifumi. Takano arranged for the deaths of Tomitake, Irie and Rika: Tomitake was injected by H173 and dumped on the side of a road to meet his end; Irie was poisoned with narcotics; Rika was disemboweled at the shrine. By citing her grandfather's theories after Rika's death, she was able to oversee the extermination of the entire town.


For more information on the conditions for extermination, see On the Emergency Manual #34.

For information on the procedure itself, see Emergency Manual #34 .



TriviaEdit

  • It can be suspected that the gas used in the GHD was a VX nerve agent. As suggested by the condition of the bodies seen in  Yakusamashi-hen. All of the bodies shown had trademark symptoms of nerve agent poisoning,  i.e., constriction of the pupils, involuntarily salivation and lacrimation. (Seen as dried drool marks and tear streaks running down their faces.)
    Higurashi kai 5b

    Aftermath of the GHD

Mion Keiichi Shion

Mion, Keiichi, and Shion lie dead due to the GHD.

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