yes

You can't because normal web language chars are unicode or something, and lfs doesnt recogonise it because lfs uses its own language system. That's why they appear as question marks.

I think it was work if you set your computer correctly. There is a system setting like "Language for non-Unicode programs" or similar. You can search in google for that along with your version of Windows and you should be able to set it to Japanese in control panel, then I think you will be able to paste Japanese text into LFS. I think you need to set the LFS input to Japanese at the same time, using the standard Windows shortcuts.