Millenium Research Institute (千年王国研究所 Sennen Ōkoku Kenkyūsho) is a consulting center run by Ichirō Umoregi and Mephisto III. The institute fulfills supernatural requests involving Akuma.
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Notable Events[]
2023 Anime[]
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| Countries | France • Japan • Mexico • Romania • Vietnam |
| Islands and Territories | Baruru Island • Easter Island • Hōkiboshi Island • Konpira Island • Kikaiga Island • Kumojima • New Guinea • Porogon Island |
| Districts and Prefectures | Aichi • Akita • Aomori • Chiba • Ehime • Fukui • Fukuoka • Fukushima • Hiroshima • Hokkaido • Hyōgo • Gifu • Gunma • Ibaraki • Ishikawa • Iwate • Kanagawa • Kagawa • Kagoshima • Kyoto • Kōchi • Kumamoto • Mie • Miyagi • Miyazaki • Nagano • Nagasaki • Nara • Niigata • Ōita • Okayama • Okinawa • Osaka • Saga • Saitama • Shiga • Shimane • Shizuoka • Tochigi • Tokushima • Tokyo • Tottori • Toyama • Wakayama • Yamagata • Yamaguchi • Yamanashi
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| Cities and Towns | Chofu • Ikebe • Kaminoke Village • Kurokage Village • Mukuro Village • Paris • Sakaiminato • Shikabane Village • Yōkai Yokochō |
| Residences | GeGeGe House • Shinigami No. 99's House • Sōkai Apartment • Yōkai Apartments |
| Businesses | Chinese Cuisine Dokkyakuki • Dai Furoyashika • Fujimi Hot Springs • Game Play • Hakusanbō's Theater • Honekawa Hot Springs • Gasha-Dokuro Hot Springs • Millenium Research Institute • Opera Hotel • Yagyo Research Institue • Yōkai Hospital |
| Forests | Aokigahara Forest • GeGeGe Forest • Kinoko Forest • Mokuren Village |
| Mountains | Mt. Atago • Mount Daisen • Mount Date • Mt. Fuji • Mt. Kurama • Mount Penglai • Mount Oguro • Osore Mountain • Tono Mountain • Yama-Tengu's Mountain |
| Swamps and Beaches | Nyūdō Swamp • Obebe Swamp • Odoroga Swamp • Yumigahama Beach |
| Lakes | Lake Rado |
| Organization Buildings | Angkor Wat • Atago Shrine • Yōkai Castle |
| Passageways | Bridge of Time • Rainbow Bridge • Yomotsu Hirasaka |
| Others | Elephant Graveyard • Eternal Tree • Gyūki Rock • Ikazuchi Rock • Kappa Pond • Medama Chasm • Spring of Kiyomi • Whale Graveyard • Yashaga Waterfall • Yōkai Hot Springs |
| Residence | Enma-Daiō's Palace • Gaki Village |
| Prisons | Prison of Treason |
| Others | Western Underworld • Land of Unbeing |
| Worlds | Cat Street • Dream World • Hidden Village • Kinoko Forest (Yama-Tengu's Mountain) • Mirror World |