Services for recruiting Japanese research participants

I've been asking everyone in my network, done Google searches, and checked StackExchange but still haven't found good answers.

I'm running a research study where I need to recruit 90 participants from Japan and 90 from the US for a 1.5 hour group discussion study on Zoom.

Do you know of any services/platforms where I could recruit Japanese user research participants (and even better, both US and Japanese participants)? I've been looking into Lancers, but I understand that most people on that website are freelancers.

Thank you for your help or any leads! :)