Keyboard mapping : JP keyboard -> US keyboard like

.xmodmaprc

! unusing en-mark key next to BackSpace -> backslash (bar when push shift) 
keycode 132 = backslash bar

! unusing right bracket next to enter -> return 
keycode  51 = Return

! unusing muhenkan and henkan next to space -> space
keycode 102 = space
keycode 100 = space

!unusing katakana -> Alt
keycode 101 = Alt_R

! unusing backslash key next to Shift_R -> Shift_R 
keycode  97 = Shift_R
add   Shift = Shift_R

! CapsLock -> Control
remove Lock = Caps_Lock
keycode  66 = Control_L
add Control = Control_L