Ryuusaku is a comrade of Kei's in the resistance movement who claims to be Kei's brother, but it is implied that this is not the case.

(Source: Fandom.com)

It's the year 2019, thirty-one years have passed since the start of World War III. A top-secret child with amazing powers of the mind breaks free from custody and accidentally gets a motorcycle gang involved in the project. This incident triggers psychic powers within one of the gang members, Tetsuo, and he is taken by the army to be experimented on. His mind has been altered and is now on the path of war, seeking revenge on the society that once called him weak. <br><br>
(Source: FUNimation) 

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**Robert Buchholz** is an American producer, voice actor, script/screenwriter, story editor, and voice director. He has produced voices for anime and video games. Robert is the owner of Spliced Bread Productions.

Welcome to Neo-Tokyo, built on the ashes of a Tokyo annihilated by a blast of unknown origin that triggered World War III. The lives of two streetwise teenage friends, Tetsuo and Kaneda, change forever when paranormal abilities begin to waken in Tetsuo, making him a target for a shadowy agency that will stop at nothing to prevent another catastrophe like the one that leveled Tokyo. At the core of the agency's motivation is a raw, all-consuming fear of an unthinkable, monstrous power known only as Akira.
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(Source: Kodansha USA)