Do we need to make seat resevations with Oversized Baggage?

Do we need to make seat resevations with Oversized Baggage?

Yes,you need.
Oversized luggage is overall dimensions of more than 160 cm. You are required to reserve a seat with an oversized baggage area onto the following bullet trains(Shinkansen) from 20th May 2020.
[Destination: Tokyo - Shin Osaka - Hakata - Kagoshima Chuo]
・Tokaido Shinkansen ・Sanyo Shinkansen ・Kyushu Shinkansen
Please check here for details : (EN) https://youtu.be/T8xDJypkSdY (JP) https://youtu.be/x7iEWxBMBP0