|This article is about a/an device in Kamen Rider W.|
- "(Memory) Upgrade!"
- ―Memory attachment announcement[src]
The Gaia Memory Enhancing Adapter (ガイアメモリ強化アダプター Gaia Memori Kyōka Adaputā) is a special device, currently possessed by Kamen Rider Accel, that increases a Gaia Memory's power output threefold. Using it on his Accel Memory, he transforms into Kamen Rider Accel Booster.
Though the Museum attempted to place Gaia Memory Enhancing Adapters on the market, only one was made before the organization fell apart in the aftermath of Ryubee's demise, Terui had heard of it but didn't see it in action until after the fall of the Museum. It was stolen by Aoi Katsuragi while she was out pickpocketing, giving it to Masaru. Not realising the device's true value and assuming it was mere jewellery, this led to Aoi and her gang being attacked by the Commander Dopant, Hiroshi Sagami and his Masked Soldiers, slaughtering them all except Aoi and Masaru who escaped. Aoi was later confronted by the Commander Dopant who demanded she give it back. Accompanied by Ryu Terui who was protecting her, Aoi approached Masaru who revealed that he gave it to the 'Boss' who directed their pickpocketing operations. They then confronted him with Terui swiftly retrieving the device while also learning of its nature from the Boss, who attempted to use it on a Unicorn Memory before being stopped by Terui who destroyed the Memory with his gun. The Adapter was later claimed by Hiroshi Sagami, who used it on his Commander Memory, which enhanced his Dopant form. However, it was taken by Aoi who gave it to Terui. When used on his Accel Memory, it transformed him into Accel Booster, which allowed him to defeat the Commander Dopant. The Gaia Memory Enhancing Adapter would be kept by Terui to access Accel Booster after the ordeal, such as during the battle with the Akumaizer.