if it's anything like:
then the manu button you refer to is the econ button we speak of... it's a japanese vehicle, so I'm sure "manu" is japanese for "economic" or whatever... and not a missed english abreviation for manual... that'd probably be more likely "man"... so you have the pwr, the manu/econ and your overdrive button... the only other button should be on the thumb end of the shifter to allow shifting between gears.