Ryuichi was a member of the Japanese mafia in Jakarta working as a translator and trusted man of Goto.

He is seen for the first time translating the words of Bangun to Goto when he seeks to calm the situation between both criminal unions after the events caused by Uco.

Ryuichi receives the news of the death of Bangun at the hands of his son and is the person in charge, with fear in the body for the consequences, to communicate it to Goto, who declares the war to Uco and Bejo.

Finally Ryuichi is seen next to Keichi and the thugs of Goto when they were going to attack to Bejo and Uco, although it turns out that Rama already did the work to them.

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