So where are you seeing this as the colour you want? If it's in a magazine, or on your computer screen, it's unlikely to be an exact reproduction of the colour you'd get from a 'Japanese Red' tube or can of paint.
If you visit a DIY store you can pick up Dulux colou- sample strips to compare with your reference colour, then buy the nearest matching paint at the store.
Or try
this site. Choose red from the drop-down list, and click on 'Select'. Both Japanese Red 'Light' and 'Dark' are shown.