Guest viewing is limited

Welfare System in Japan

Furumaru is donating to a municipial city for example and reduce the income tax also you can receive some gifts from the city)
Tax Wise I recommend checking out: https://en.furumaru.jp/info/whats_tax.php

You can invest your money in this account which is taxfree (free from capital tax). Only downside is the 5 year limitation, do some research online.
For Retirement I suggest: checking NISA out (i am not a fan of the new Tsumitate NISA)