If sending ¥0, the amount that will go to fees is ¥0 and the recipient will receive ¥0. That's 0% going to fees, effectively.
* Using custom fee rate of 3.6% + ¥40
To receive ¥0, a payment of ¥0 should be sent. ¥n/a will go to fees. That's 0% in fees, effectively.