The shipment must be punctual.
Having much inventory is considered very bad in terms of cash flow and balance sheet.
As you know you have worked for manufacture, they try to keep proper level of inventory.
Please ask them to book the vessel as soon as possible.
For Tokyo side,
We should inform them of the status and advise them to re-arrange the schedule, make ETD 1 week earlier or so.
I’ll email to Japan, please see the point.