ULTRA0 is a pseudo-3D shooter designed for Windows that combines action gameplay with visual novel storytelling. Players step into the shoes of Shirogane, an elite warrior in N Country, where they must fend off waves of monstrous threats. The game features an engaging narrative that unfolds as players progress through various levels, enhancing the overall experience. Collecting supply items is essential for character upgrades, allowing for improved combat capabilities against the relentless enemy onslaught.

The controls are designed for simplicity, enabling players to focus on the action without complicated mechanics. Movement and aiming are intuitive, while automatic attacks streamline gameplay. Additionally, players can unleash powerful bombs and skills with a single button press, making it easy to strategize during intense battles. ULTRA0 delivers a unique blend of action and storytelling, appealing to fans of both genres.