He's the Witness

銀座旋風児　目撃者は彼奴だ

Also known as にかいどうたくやぎんざぶらいちょうぎんざまいとがいもくげきしゃはきゃつだ, 二階堂卓也・銀座無頼帖　銀座旋風児　目撃者は彼奴だ, Ginza sempūji mokugekisha wa aitsu da

Takuya witnesses the homicide of the detective leading an investigation into the murder of the chairman of the People’s Economic Association, and he disguises himself.