Chuo City, Tsukishima, Tokyo. The 'Takamimi Shrine' has a history of over 400 years dating back to the Edo period. The deity enshrined there is Eldar, an elf who was summoned from another world and has completely withdrawn from society. The one who promised, "Please watch over Edo and this country in my place—" is none other than Tokugawa Ieyasu!? Due to his immortality, not only does he carry on the traditions from Edo to Reiwa, but he is also steadily accumulating otaku knowledge and enjoying a life of civilization.