Ninnin Man is a lesser assassin of the JAA who clashes with Taro Sakamoto during the exhibition storyline. His ninja-styled arsenal of chained sickle and blade defines his brief showing.
The manga has not yet fleshed out Ninnin Man's physical design, identifying him simply as one of the JAA's contracted killers.
His temperament likewise remains undeveloped on the page, with the series offering no glimpse into how he thinks or behaves.
In combat Ninnin Man reaches for a kusarigama, the classic Japanese pairing of a curved sickle joined to a length of chain. He also draws a katana against Sakamoto, though the sword meets an abrupt end when Sakamoto shatters it using a shuriken folded from paper.

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Ninnin Man is a minor assassin working for the JAA who clashes with Taro Sakamoto during the exhibition storyline. His appearance is defined chiefly by his ninja-style weaponry rather than any developed backstory.
Ninnin Man fights with a kusarigama, a traditional Japanese sickle joined to a chain, and also draws a katana against Sakamoto during their clash.
Ninnin Man's katana meets an abrupt end when Sakamoto shatters it using a shuriken folded from paper.
Ninnin Man belongs to the JAA, working as one of its contracted assassins.
Ninnin Man debuts in Chapter 148 of the Sakamoto Days manga, as one of the JAA's contracted killers who fights Sakamoto.
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