Tenma Hiake, a sixth-year elementary school student who belongs to the Amatsu Little League, is suddenly sent to Mount Kurama during a baseball game in Kyoto. There, the Kukuri (youkai user) Mikazuki is fighting against Karasutengu with a giant snake. In the end, Karasutengu is tied up by a serpent, and Tenma is told by Teigetsu, ``Don't see, don't hear, and don't know what happened here,'' and leaves the place. That night, Teigetsu appears at the inn where Tenma and his friends are staying . When he met Tenma in the daytime, he forgot the amulet of Fudo Myoo. At that time, a star will appear outside.