The story follows follows Shiren, a boy who travels the mountains with his weasel friend Koppa. While they're eating, a group of demons attack the village, Natane. Shiren builds a castle to protect the village and the villagers.
To build a castle, players need stone, iron, water, earth and wood which are found in many dungeons. Afterwards, the player must protect it from demons and their leader. Harder dungeons reward better materials therefore making the castle more resistant to demons.
It was initially planned to be a 64DD game, but was later announced as a cartridge-based Nintendo 64 game. The game was planned to be released in April 2000, but pushed back to September 27, 2000; never being released internationally. In 2010, Chunsoft stated that they would re-release the game on the Wii's Virtual Console if fans of the series showed their demand, but that they had no plans for it at the time.
Writers for IGN said that the dungeon exploration could get monotonous; they said that what they played was decent, but that they "weren't blown away", and that the gameplay, while acceptable, was plain. They enjoyed the game's graphics, saying that the characters and landscapes were detailed to a level that was "uncommon of a first-generation product", and that the 3D effects helped "beautify" the environments.
In their cross-review, Famitsu scored the game a 36 out of 40, with the individual reviewers giving it 9, 10, 8 and 9; this was one of the highest scoring games of 2000, with only seven other games scoring 36 or higher in that year. During its debut week, it was the best selling game in Japan, with 147,864 copies sold. By the end of 2000, it was the 49th best selling game of the year in Japan, with a total of 238,338 copies sold; an additional 45,653 copies were sold during the following year, for a grand total of 283,991 copies sold.