While getting chased by Great King Enma, he accidentally falls into the Moon Hole (月の穴 Tsuki no Ana), which time-warps him to modern Japan via the Full Moon Road (満月ロード Mangetsu Rōdo). The furious Great King Enma sends his three adopted oni children, Aobei, Kisuke, and Akane, who are known as the "Little Child Trio" (子鬼トリオ Kooni Trio), to pursue Ojarumaru and get the scepter back. At the present time, Ojarumaru falls from the Moon to the roof of Sakata Apartment (坂田マンション Sakata Manshon) where he befriends a boy named Kazuma Tamura and his grandfather Tommy.
The sequence of events unfolds as Ojarumaru flees from Great King Enma, inadvertently tumbling into the Moon Hole (月の穴 Tsuki no Ana), which propels him to modern Japan via the Full Moon Road (満月ロード Mangetsu Rōdo). In response, Great King Enma dispatches his three mischievous oni offspring, Aobei, Kisuke, and Akane, also known as the "Little Child Trio" (子鬼トリオ Kooni Trio), to capture Ojarumaru and retrieve the scepter. At present, Ojarumaru finds himself on the roof of Sakata Apartment (坂田マンション Sakata Manshon) after falling from the Moon, where he befriends a boy named Kazuma Tamura and his grandfather Tommy.