Hi,
You won't be able to do this with the custom field price plugin or the cart fee plugins. They are not made for this.
However, you can do this with the default "manual shipping method plugin" preinstalled in HikaShop.
For that, you need to :
1. Go in the menu System>Shipping methods
2. Click on the "new" button and select the "manual shipping method plugin"
3. Turn on the "published" setting, the Yen in the "currency" setting, and make sure the "with tax" setting is turned on
4. Enter 0 in the "minimum price" setting, 20000 in the "maximum price" setting and 400 in the "price" setting
Repeat these steps for each price range, with the corresponding shipping fee. Note that once you created one shipping method with the correct name and description, you can use the "copy" button on the Shipping methods listing to duplicate it, so that you just have to edit the copies, and change the "minimum price", "maximum price" and "price" settings.
Also, please make sure your products have a weight.
The system will automatically select the correct shipping method based on the cart subtotal amount