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Official Site: Toei Company

The is a fictional organization in the Japan Super Sentai series GoGo Sentai Boukenger that collects hidden treasures that have suddenly begun to disappear all over the world. These treasures include relics from early civilizations, sunken ships, unexplored regions, and fossils of animals long gone, all of which are called "Precious". The S.G.S. discovered these Precious and organized a secret team to defend them from those who wish to use the relics' powers.

was once an enthusiastic treasure-hunter known as the "Immortal Fang", the tragic deaths of his partners Kyouko and Masaki in a blaze trap made him retire, only to be hired by SGS. With a calm exterior, Satoru actually hides hot blood inside, as evidenced when he simply catapulted Masumi and Natsuki into the Go Go Dump's bucket and carried them and an entire tub of dirt and gravel at full throttle out of the Goadom temple before dumping the entire load upon coming to a full stop. He says "Attack!" and simultaneously snaps his finger at the end of each order he gives to the others. He refers to the other Boukengers by their respective colors, something that Masumi has a thing against. He is also seemingly oblivious to Sakura's heavily implied attraction to him. He became filled with self-doubt in Task 4 after Go Go Vehicles 1~5 were buried under ice in a deep crevasse, the resulting suffering of his teammates sparked his memories of Kyouko and Masaki. It took his mighty willpower for him to control the overload-prone Go Go Drill and prevent history from repeating itself. Satoru used to be a huge fan of Jimon Kagawa's writings about heroes. He is a constant rival of Ryuuon and took Ragi, a human whom Ryuuon had transformed into a Wicked Dragon, under his protection and received "the Greatest Adventure" while restoring the Water Metropolis. Satoru was given the offer to quit the Boukengers and join SGS Rescue, but he refused, because he likes to have his own adventures. Instead, he gave Eiji the Go Go Changer. During the events of the Boukenger movie, Satoru encountered his father Kouchi, whom he eventually settled his affairs with.

Satoru at times has gone off by himself to find Precious or protect his comrades. In Task 10-11, he let Ryuuon and Gaja take DaiBouken with him inside to the secret island where SGS kept the Manuscript of Leon Giordana. In Task 42, when all of the Go Go Vehicles were damaged by Gai and Rei's new Homunculus, he took SirenBuilder, since Eiji at that time was frozen in stone and was never used, to go stop the Quester controlled Homuculus. His real intention was to detonate SirenBuilder with the Homunculus holding on, but everyone came in time to tell Satoru that they are a team and cannot do everything alone. He fought Ryuuon for the final time, only to endure the destruction of the Precious Bank thanks to Zubaan. He then followed Desparado in the modified DaiVoyager. Six months after the final battle with Gaja, Satoru left the Boukenger team to take on a new adventure by taking the space-worthy GoGo Voyager into space to fight outer space Precious, though he was surprised that Sakura followed him, and apparently utterly clueless as to her true intentions. However, when Sakura is possessed by Pachacamac, Satoru is forced to aid him in obtaining the two jewels the monster needed to regain his power. Once Sakura is freed, Satoru aids his team and the Gekirangers in defeating Pachacamac.

Satoru Akashi is portrayed by .

GoGo Sentai Boukenger has not been a contender in any CBUB matches.