The product ID refers to the Japanese adult visual novel and interactive voice experience titled Eroipu! ~Hentai Kanojo to Video Tsuuwa de Sougo Onanii Seikatsu~ (roughly translated as Ero-IP! ~Mutual Masturbation Life with a Perverted Girlfriend via Video Call~ ).
The "RJ" prefix is a standard indexing system used by DLsite to categorize adult-oriented doujin (indie) works. These titles are often produced by small independent circles or solo creators rather than large studios, allowing for niche themes and experimental gameplay mechanics. Fans of the genre often search for these specific IDs to find high-rated interactive experiences that utilize binaural recording techniques. rj01277982
Here is a review breakdown of the game: