Searching for a Claire Bible manuscript, Lina and the others find an ancient book describing a musical spell. The spell requires participants to dress up in costumes and chant together. Lina thinks the song being is a holy spell of magical protection but it turns out to be a lost festival song to summon holy light and flower petals. When she discoveres this discrepancy, she blows up everyone with a hastily cast Dragon Slave.
Among the ruins of the city, there is a game only children can play. It is called “Otokoyo”; a game of hide-and-seek. But whenever children play this game, one by one they would disappear into the blinds of the buildings… The story begins when a boy enters the world of Otokoyo, to find his missing sister.
The film contains nine skits made for the Toei Anime Fair. The Tamagotchi in this film don't speak but rather communicate via sounds similar to that of Pokémon Speak. This is unique because all the other anime adaptations of the franchise have the Tamagotchi speak Japanese.