Starting from 2025/6/2, customers will be able to order empty containers via Cyber Port at Aomi Terminal 4 in Tokyo Port and Honmoku BC Terminal in Yokohama Port.
The correspondence forms for both terminals are as follows. Here See.
?Empty Container Pickup Order
?Container Cargo Delivery Form

(updated 2025/5/30)
We have prepared a manual on the operation and operation of container removal procedures at Aomi Terminal 4 in Tokyo Port and Honmoku BC Terminal in Yokohama Port.
When performing the applicable procedures, refer to the manual at the following URL.
Tokyo Aomi A4 and Yokohama Honmoku BC Operation and Operation Manual

the Ministry of Land, Infrastructure, Transport and Tourism also introduced this issue in a press release.
https://www.mlit.go.jp/report/press/port05_hh_000380.html