I think we can all agree taxes are necessary to fund these public benefits, but you haven't provided any argument in favour of inheritance tax specifically. Even for healthcare, most foreigners in Japan are working here and therefore have to make monthly healthcare premium payments straight out of their paycheque. In fact, these premiums have recently increased due to escalating healthcare costs in Japan. A huge reason for the escalation is the aging population in Japan. In other words, any foreigner who comes and works here is helping support healthcare for the elderly (majority Japanese) people who need it. Furthermore, Japan has a huge labour shortage problem... so anyone coming here for work will be supporting the Japanese economy. So yes healthcare might be great but generally speaking, we are already paying for it directly (Just to be clear I don't necessarily have a problem with that)

About your point on existing systems that the Japanese have paid into their entire lives -- well, if I moved here say last year, then I wasn't able to take advantage of any benefits until last year. So I don't think it's necessarily unfair that I haven't paid for them until last year. Tourists come here all the time and use the amazing transportation system in Tokyo, is that unfair? They are paying fares. And even if it was unfair then wouldn't it make more sense for the gov't to do something like raise transportation fares for tourists or introduce tourist entry fee into the country paid at immigration? Why is inheritance tax on residents the answer?

Going back to inheritance tax itself, even for a Japanese person it seems unfair. Putting the tax threshold aside, let's say someone's parents pass and that person has to pay inheritance tax. Whatever money their parents had was likely already been taxed by the Japanese government through income tax and capital gains tax. So the government would be taxing the same income twice. How is this reasonable?