The service is operated with a sharing baggage storage service called Ecbo Cloak who have launched their first service in January 2017.
They have bridged people who are in need of somewhere to place their luggage and the venues which have the space to give them a hand.
It has given over a hundred cafes and shops across Japan, and now they have reached out the storage place to a several major post offices including Tokyo Central Post Office.
It may be a good idea to have your luggage kept at Tokyo Central Post Office in the morning, spend some time to explore Tokyo station (Marunouchi) area, and collect your reserved Shinkansen tickets from us along with your luggage at Tokyo Central Post Office before starting on your Shinkansen journey to other areas.
Ecbo Cloak - Luggage Storage in nearby post offices
(Tokyo Central Post Office is described as "Tokyochuo Post Office" in ecbo cloak website)
Your seat is reserved and secured when you book your tickets. Head to the station with a peace of mind.
Better seats and free blankets. Popular among Japanese business persons, executives and people who
Know as "First Class" of Shinkansen seats. Only available on Hokuriku and Tohoku Shinkansen lines.
You can take any open seats in unreserved cars of any train on the departure date. (No departure time will be indicated on your tickets.)
The best seat type if your priority is the cost and are traveling during less-crowded season/time.
For further information and photos, please visit official page at http://www.jreast.co.jp/e/ticket/types.html