Japan have to choose their immigrants wisely and preferable that share similar lifestyle.

Not limited to
Diet - Consume pork and drink alcohol
Culture - Willing to accept local customs and culture
Law - Protect underage girls

Don't be like EU simply choose those immigrants don't share their values.

Diet - HARAM pork, HARAM alcohol
Culture - Have to practice own cultures, others are view as satanic practice.
Law - Marry underage girls is a NEED. Boys too...

Owaiii...