Please don't spread misinformation if you are not sure of it.
I am just back from Japan, so here are my experience of using this card:

1. You can preload it with yen and withdraw from their ATM. Granted that you find those that accept overseas Visa cards. Some examples include 7Bank (can be found in 7-11) and Japan Post  Bank.

2. Minimum withdrawal is 10,000 yen (for both 7Bank and JP bank that I tried). 7Bank processes a fee of 108 yen for 10,000 yen withdrawal, 216 yen for 20,000 yen withdrawal. Now I don't think there is ATM that does not have a fee anymore.

3. Merchantrade charges RM10 for each withdrawal. This transaction will NOT be recorded. So do take note.

4. Including all the fees, it is still worth it compared to exchanging money at money changer, as long as you transact more than RM50. Granted you can find ATM that accepts <10,000 yen withdrawal.

5. If you have enough yen, everything will be deducted in yen. If not, it will deduct yen first, then top up the remaining yen from your RM, with an extra small fee.

6. Japan is a little bit behind in cards acceptance. Most shops still swipe your card. Do make sure your magnetic stripe is still in good conditions. (No pins anywhere, signature please)

7. Major tourist shops and restaurants accept cards. I am able to get by with 30,000 yen cash for 2 weeks. (Well, I don't spend that much actually, so a bit of salt please)

8. Do carry some cash before you go. Transit tickets machine do not accept cards.