Before understanding the video, one must understand the setting. A "Soap Land" (ソープランド) is a legal adult entertainment establishment in Japan. Euphemistically, it is a bathhouse where a "companion" assists a client with bathing, body washing, and uses a unique air mattress covered in lubricant for a specific style of body-to-body massage.
She drops it into the trash bin.
Disclaimer: This post references an adult‑oriented video. Viewer discretion is advised; the content is intended for audiences 18 +. DV 1150 Yuma Asami Soap Land