Hello Hidetaka,
Thank you for contacting eBay Customer Service about an item you want to cancel.
I understand that you would like to have the item cancelled but the seller no longer can.
I know this must be concerning on your end since you do not know how to proceed.
My name is Rina and allow me to check on this.
Hidetaka, I checked on your account and I am certain that you are referring to the item FLUGELHORN.
I see here that your seller has rejected the cancellation.
But really, you do not have to worry and you may now consider it as cancelled as I see that your seller is no longer on eBay.
With this being said, you do not have to do anything further.
I am positive that the information I provided will help you on the item you wanted to cancel.
We appreciate you for taking the time to contact us about this.
Thank you for choosing eBay.
We value your business.