Magatsuhi (禍津日神, God of Disaster) is the main antagonist of the Zombie Land Saga Gaiden manga, introduced in chapter 10.
He is a malevolent divine being who causes misfortunes in the human world and particularly in the Saga prefecture. He belongs to the land of Yomi, the underworld.
He manifests in child form but wearing an Oni mask on his head and his hair is shaggy and unkempt, he wears a white robe with nothing else of clothing. It is unknown if he has a real face behind his mask.
By retrieving much of the power from him, he is able to control Sagakos, in this case a Kaiju-type. He manifests as a demon face in front of Sagako's face and has multiple eyes and limbs.
He appears in front of Higashino when Higashino throws Doro-chan across the border, vaguely explaining vaguely how the Sagako works. Despite not intending it for him, he makes a deal with Higashino whereby he would get a wish he wanted if he killed the Sagako so that he could take back the power from him.
A few weeks later he regains the power from him and via telepathy communicates to Higashino about it. When the detective is in front of him to fulfill his wish, Magatsuhi begins to speak an unknown language that makes Keiji angry and makes him lose his sanity, which causes him to end up murdering him in front of traffic.
- Telepathy-Through telepathy, Magatsuhi can communicate with his targets at a distance, this same telepathy seems to be done in an unknown language.
- Induce madness - This language, or way in which it communicates, seems to affect exposed humans by making them violent and maddening.
- Spectral apparition - He Appears briefly in front of Higashino to speak momentarily with him, only to disappear moments later.
- Curse of Saga - It seems to be the cause of all the misfortune in Saga, mainly from the Sagakos.
- Magatsuhi-no-kami (Japanese for "kami of the force of misfortune"). In Shintoism, divine beings that cause sin, pollution, disaster and evil. Related terms are Ōmagatsuhi-no-kami, meaning "Great Magatsuhi Kami" and "Yaso-magatsuhi-no-kami", meaning "Countless Magatsuhi Kami". 
- The Yomi, is the Japanese word for the land of the dead (World of Darkness). According to Shinto mythology as related in Kojiki, this is where the dead go in the afterlife. Once one has eaten at the hearth of Yomi it is (mostly) impossible to return to the land of the living. Yomi in Japanese mythology is comparable to Hades or Sheol and is most commonly known for Izanami's retreat to that place after her death. Izanagi followed her there and upon his return he washed himself, creating Amaterasu, Susanoo, and Tsukuyomi-no-Mikoto in the process.
- The mask that Magatsuhi is wearing is a reference to the performance of Memburyu from Saga Prefecture. Menburyu is a popular performing art that is often performed in Kashima City, Saga Prefecture. This is a form of demon mask dance in which dancers hang a drum in front of their bodies and dance to the beat of gongs and taiko drums. By performing the Menburyu dance, participants show their gratitude for bountiful harvests, praying to the gods for rain and purging vengeful and evil demons. 
|• Kotaro Tatsumi • Tae Yamada • Sakura Minamoto • Saki Nikaido • Ai Mizuno • Junko Konno • Yugiri • Lily Hoshikawa • Policeman A • Romero •|
|Takeo Go • Reiko Amabuki • Arata Ookoba • Inubashiri • Jofuku • Maria Amabuki • Skull and Bull • Shiori Baba • Yui • Misa Higashitsuru • The Mysterious Man • White Ryu • Light Oozora • Maimai Yuzuriha • Shojiro Ito • Kiichi Momozaki • Cocco •|
|• Hinasaka President • Drive In Tori President • Announcer Girl • Machiko • Saga Governor •|
|Eikichi Hyodo • Yuko Hyodo • Anna Shuri • Tae Yamada • Hanako Hakase • Jofuku • Takeo Go • Sachika • Keiji Higashino • Araki Aiba • Magatsuhi • Romero • Yasuko Hyodo • Mr Yamada • Mrs Yamada •|
|• Tae Yamada • Sakura Minamoto • Saki Nikaido • Ai Mizuno • Junko Konno• Yugiri • Lily Hoshikawa • Romero •|
|• Pine Sagako • Hot Springs Sagako • Love Sagako • Cassete Sagako • Squid Sagako • Human Mannequin Sagako • Spider Egg Sagako • Goby Eel Sagako • Mudskipper Sagako • Giant Spider Sagako •|
|• The Curse of SAGA • The Prosperity of SAGA •|
|• Zombies • Sagako • Jofuku • Magatsuhi •|