50K Email Gathering: B2C Marketing Japan/US

I'm embarking on an email marketing campaign targeted at youngsters from 15 age to 35 age , predominately located within Japan and the United States. I require a freelance expert with the necessary tools and know-how to help me gather a minimum of 50,000 email addresses to facilitate this campaign. A break down of my requirements:

- 30,000 Email Addresses from Japan.
- 20,000 Email Addresses from United States.
- Young professional and B2C are main focus
- Ideally, the freelancer should have prior experience with email scraping, and must ensure all practices align with legal and ethical guidelines.
- Any experience with demographics, Direct Email marketing will be considered a significant benefit.