Taxation on offshore hedge / mutual funds

Has anyone had experience investing in overseas unlisted mutual funds / hedge funds? I'm considering investing in one which is domiciled abroad (Luxembourg) and I'm wondering how the tax treatment would be.

I'm pretty sure they are considered general shares (not listed shares / 上場株式等) which makes me wonder if they are tax-efficient. Especially since they are primary market transactions, my main concern is around deemed dividends upon redemption.

Normally I would think the fund is taxed upon redemption as capital gains tax at 20.315% based on it's NAV but I want to hear anyone's thoughts on this.

The transaction does not go through any Japanese party. It's an offering from a overseas asset management company. The investors must be accredited investors as well, so it is not a product that can just be bought through any brokerage without authorization.

Many thanks!

by robinson894