Luggage forwarding/ shipping

Alright. I’m pulling my hair out here.

We are travelling to Japan soon and trying to figure out how we can ship our bags from Tokyo to Shin Osaka. Problem is, where we are staying in Shin Osaka does not accept luggage delivery because they have an unmanned reception (Aparthotel situation). So we fly into Haneda and fly out to Osaka the next day. My grand plan was to send off our big bags to the Yamato luggage counter at Shin Osaka station (East Gate) and pick it up once we settle into our accommodation… But I can’t find anywhere to see if this is possible?!

Does anyone know if my plan is possible?? Or will I be having to lug big bags around with me and my two kids?

Signed,

Unnecessarily stressing.