Search for "Noto Sans CJK JP Thin download" (via Google Fonts or GitHub). It is the ethical, safe alternative that 99% of users cannot distinguish from Hiragino.
For commercial use on Windows or offline environments, buy directly from the foundry: Hiragino Sans W0 Font Free Download
Hiragino Sans W0 is a popular Japanese sans-serif font designed by Morisawa, a renowned Japanese type foundry. The font is part of the Hiragino font family, which is widely used in Japan and other countries for various applications, including publishing, advertising, and digital media. Search for "Noto Sans CJK JP Thin download"
If you own a Mac (macOS 10.14 or later), you already have Hiragino Sans. However, W0 is not enabled by default in font menus. To access it: The font is part of the Hiragino font
Attempting to download it from a pirate site exposes you to malware, legal action, and corrupted files. The smart, professional, and ethical path is to either: