https://bugs.winehq.org/show_bug.cgi?id=37382
--- Comment #8 from kddc3s@gmail.com --- (In reply to Sagawa from comment #6)
Your backtrace shows the fault occurs inside MessageBox. Could you provide us debug trace with WINEDEBUG=msgbox?
Please refer to http://wiki.winehq.org/FAQ#head-16da35b6327024d6ea576e3678488b16862d0f5e (How do I get a debug trace?) for details.
I got demo version of the software from publisher's web page, but I can't reproduce this issue. Kyonyuu fantajii uses 800x600 resolution by specs. So, you might run another version, e.g. download version.
I have played other games that using the same game engine, they all encounter the same issue, including the demo version u said.