Well, he can definitely find and follow the shady Japanese people in dark suits. They also train at a dojo where you can see all the nice tattoos they have (except Kenta who doesn't have any). And it would be fine to see some shady business deals, meetings at hotels or in dark alleys.
After that most of the rest is money laundering and they try to avoid fighting in the streets and killing people because they're here low key.
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After that most of the rest is money laundering and they try to avoid fighting in the streets and killing people because they're here low key.