In this context, the term likely refers to one of the following:
A common shorthand for digital "wallpapers" (backgrounds) for phones or desktops featuring these specific characters and models. Kokoro x Zero Two by Hidori Rose and Virtual Ge...
This specific project is a mashup of characters from the anime Darling in the Franxx (Zero Two) and Dead or Alive (Kokoro), reimagined through the lens of these creators. In this context, the term likely refers to
The phrase "Kokoro x Zero Two by Hidori Rose and Virtual Ge" refers to a between popular cosplayer Hidori Rose and Virtual Ge, typically involving a digital photobook or video set . In this context
A specific publication or "fanzine" style release where the collaboration was featured.