Ys IX: Monstrum Nox is an action-packed game developed by Engine Software for the Nintendo Switch platform. The game takes place in Balduq, a prison city in the Gllia region controlled by the Romun Empire. Balduq is known for its prison facility and high walls, and it is an important transportation hub in the region. Recently, rumors of beings called "Monstrum" have started to spread, who possess unique supernatural abilities and are either helping or harming the helpless villagers.

The game is set in a thrilling and intriguing storyline where the players take on the role of Monstrum with their unique abilities to fight against the dangers of the city. The game features a wide range of inns, bars, trade centers, and public facilities such as theaters and baths, making it a fully immersive experience. With its captivating storyline, challenging gameplay, and stunning graphics, Ys IX: Monstrum Nox is a must-play game for action game lovers on the Nintendo Switch platform.