9 nine Episode 4 — is a visual novel with sexy content, elements of nudity, bawdy dialogues and seductive girls that constantly appear on the colorfully drawn anime-style slides. The new part of the franchise continues the story of the brother and sister, whose names are Sora and Kakeru Niimi, they are still drawn into something supernatural, because of which they must go on a long journey to save the whole world from the villains who threaten the total destruction of planet Earth. Most of the time of the single-player campaign with the ability to collect collectibles, the gamer will spend investigating a murder case that happened under secret circumstances.