For EKDV691 specifically, the "selling point" is the contrast between Yua Mikami’s innocent idol face and her aggressive, participatory role in the scenes. She is not a passive participant; the title markets her as an equal agent of desire.

It is not a recognized tail number or standard shipping code. If "ekdv691" refers to an internal project code private document specific serial number

If you are a collector or fan of the genre, EKDV-691 represents a title from a well-known series ( Natural Water from Nature ) known for its production quality regarding lighting, camera work, and specific thematic elements (hydration/stamina). For fans of the actress Nanami Misaki, this release falls within her active period in 2023 under the SOD Star label.