"SKY ANGEL BLUE" is a subseries of SKY HIGH's larger "Sky Angel" brand, focusing on content in 1080p Blu-ray format. It was a prominent series during the early to mid-2010s, a period when high-definition adult content was becoming more widespread. Volumes like 113 were part of a long-running catalog that featured many different actresses.

Many JAV studios released "exclusive" cuts or special bonus discs for premium members or specific distribution partners. A video marked as "Exclusive" implies that it may contain extra scenes, alternative camera angles, or higher bitrate encoding than the standard retail version. For a fan of Rei Furuse, owning this specific "Sky HD" version is the digital equivalent of owning a director's cut or a limited edition, capturing her performance in the highest possible fidelity.