To be honest i haven't found a single database that's useful for Japanese games, i use collectorz but i had to put the work in to make my DS game collection fit, bought a usb flatbed scanner & a barcode wand and just did my own thing adding them all manually as there isn't decent quality boxart for a lot of the titles in my collection. Yeah it's not quick or easy but once added i can now bring up any game with a beep of the barcode scanner. Trying to use the online capability to let the database fill in itself was a fruitless task as it barely found any of the games in my collection besides the popular DS titles. Slowly working through all my collections adding them in as it's useful to have a proper tally of what i do & don't have.