Yes, agreed. I lived in Matsue a couple years ago and found a couple nice spots that were covered in ocean trash. Loads of plastic bottles both from Japan and other countries (there was a milk carton from Australia), styrofoam, polyester apparel, some random other stuff.

Pic: https://blog.qiqitori.com/wp-content/uploads/2017/08/DSC0249...

Boring blog entry: https://blog.qiqitori.com/2017/08/beach-cleaning-in-matsue-j...