Oppai Odyssey is an adult visual novel and dating simulation game set aboard the USF starship Agni. Players embark on a journey through space, engaging with the ship's crew as they search for a new planet for humanity's colonization. The game features a richly detailed starship environment, allowing for exploration and interaction with various characters. Players can experience a variety of events and storylines, enhancing the immersive experience of the game.

The game combines elements of adventure and relationship-building, providing choices that affect the narrative direction and character relationships. As players navigate through the galaxy, they can partake in various activities with crewmates, deepening connections and uncovering unique story arcs. Oppai Odyssey offers a blend of engaging gameplay and visual storytelling, appealing to fans of the genre.