Urxvt non-latin copy-paste

Question

Hello.
I've used tutorial from Archlinux wiki to get easy copy (ctrl+c) and paste (ctrl+v) in urxvt. The problem now is that urxvt can't paste non-latin characters correctly.
For example, I need to paste this to terminal:
Région parisienne
Guake terminal can render the above text correctly, while urxvt displays
Région parisienne
The same error also happens with Japanese characters, although I can type directly Japanese to urxvt using ibus-anthy.
The copy-paste extension uses a perl plugin shipped with standard urxvt installation.

Answer 1

@Ranmaru;
already have it xD. I can't use middle click, no mouse and my touchpad's buttons are a bit off.
@Mr. Pedobear:
[hinagiku@alice-tan urxvt-clipboard]# locale
LANG=en_US.UTF-8
LC_CTYPE=ja_JP.UTF8
LC_NUMERIC="en_US.UTF-8"
LC_TIME="en_US.UTF-8"
LC_COLLATE=C
LC_MONETARY="en_US.UTF-8"
LC_MESSAGES="en_US.UTF-8"
LC_PAPER="en_US.UTF-8"
LC_NAME="en_US.UTF-8"
LC_ADDRESS="en_US.UTF-8"
LC_TELEPHONE="en_US.UTF-8"
LC_MEASUREMENT="en_US.UTF-8"
LC_IDENTIFICATION="en_US.UTF-8"
LC_ALL=
[hinagiku@alice-tan urxvt-clipboard]# locale -a
C
POSIX
de_DE.utf8
en_US
en_US.iso88591
en_US.utf8
ja_JP
ja_JP.eucjp
ja_JP.ujis
ja_JP.utf8
japanese
japanese.euc
ko_KR
ko_KR.euckr
ko_KR.utf8
korean
korean.euc
Should I set LANG to ja_JP? Even without Japanese locale, backslash is displayed as Yen sign in terminal and Qt apps.