Shiira is Japanese browser based on webkit and seems to be pretty damn similar if not the same as Safari. I would be hard pressed to point out any differences in the few minutes I tried other than these few details…
Keyboard Shortcuts for bookmarks in the bar don’t work
You can use your safari bookmarks directly without import, Shiira can actually read the file itself and loads things in as though it was native.
Other than that, I don’t read Japanese, so I have no idea what it says on the website. It feels like a Safari clone to me… If you want to surf different, yet like Safari, Shiira might be for you.