Government determined to increase population to 7 mil in 2030.

[yeokiwi]

In fact, i respect the japanese, they have learnt to live with it.

Technical perspective..

Although Japan is facing the same problem as Singapore, their problem cannot be resolved by immigrations unlike Singapore.
Cultural difference aside, the number of immigrants to top up Japan is huge. Just this year alone, in order to maintain the same population as last year, they will need 200k immigrants and the number will get bigger and bigger yearly. The scale is liken to importing all citizens of a small country to Japan in the next 10-20 years.

In Singapore context, 10-20k per year to top up population is still inherently possible.

So, essentially, from the point of cultural difference and technical difficulty, immigration is not a solution for japan.