Kyougoku Daijirou is the 15th generation owner of the Kyoto sweets shop Amashoudou. One day, Daijirou discovers a giant robot named Doamaiger D in his store's basement. At the same time, enemies called "Mekaijuu" appear in Kyoto and begin wreaking havoc.

An unknown person has started a mysterious "ceremony." It is something that already exists before meaning is even born. Once begun, it cannot be stopped. Is it a blessing, or a ritual of farewell? And where does the answer lie? The film portrays the story of one such "ceremony" that exists somewhere in the world.