: Suggests the work was released or marketed as a special edition in 2021.

The plot often hinges on the protagonist obtaining contact information or "scandalous" photos (such as upskirt images) to gain leverage over the character.

: Translates to "The Girlfriend the Boyfriend Doesn't Know," a common theme in dramatic or adult-oriented manga.

The "Shiri Ochi" label immediately sets the tone for the cinematography. It promises a specific aesthetic—one that highlights the curvature, the movement, and the allure of the female form from behind. In File 02, the camera work is impeccable. The lighting creates a softness that contrasts with the explicit nature of the content, turning the "hips" into the central character of the visual story.

: Released by the label Shiri Ochi , it is known for high-definition visuals and a focus on specific tropes, such as "secret affairs" or "netorare" (NTR) elements.