Being in Japanese Locale mode is not enough. Use Locale Emulator and set it to run in Japanese mode with Administrator rights and it will run every time when you press Yes to continue.
-extract 18禁ゲーム) [101029] [sprite] 恋と選挙とチョコレート 初回限定特装版 (iso+mds+rr3).rar
- mounting and install
- extract ksc_updater.zip to where you install
-extract つ (NoDVD EXE)(101029) 恋と選挙とチョコレート rev3.rar to where you install
- start with "start.exe"
- it ask serial number , open your serial.txt . copy paste....
Or try to reinstall it whit admin rights