Why? The compilation used a specific musical score by Takayuki Miyauchi that was only licensed for the theatrical exhibition, not for home video. Furthermore, the master film reportedly suffered water damage during a storage move at Toei in the 1990s.
The film is an expansion of the series' lore, centered on a high-stakes rescue mission. The plot kicks off when the Bio Team discovers that the Neo Empire Gear is targeting two young boys who possess an ancient treasure map. This map supposedly leads to the , an location of immense strategic importance to both the heroes and their mechanized enemies. choudenshi bioman the movie
