Monsoni is a spin-off project of the popular game Monster Strike, focusing on music as its theme. Players can expect unique characters like Lucifer, Satan, and Ibaraki Doji forming music groups such as the "Immoral Pistols." The game features an original story exclusive to the app, set in Monsoni City, offering a fresh narrative experience. Moreover, the game boasts full voice-overs by a talented cast of voice actors, enhancing the storytelling.

Monsoni is free to play, with in-app purchases available for certain items. The game requires iOS 13.0 or later to run smoothly, ensuring compatibility with newer Apple devices for an optimal gaming experience.