Thank you for your insightful comments @AnubhaBangia and curiosity about the lockers,
These luggage lockers are virtually everywhere in Japan so that tourist and locals both can move freely without luggage anywhere without the load.
I have captured many such luggage lockers and captured the entire process, and I think it should be the next topic for a new post.
I had previously put it way down in the list. Thank you once again for this hint.