The title typically refers to a flash-style or standalone PC game that focuses on the interactive transformation and modification of a character named Mystic Lune.

The software is noted for its "complete" suite of customization options compared to similar niche titles.

Extreme Modification Magical Girl Mystic Lune is a 3D adult-themed sandbox game or technical demo focused on highly detailed physical transformations and "modifications" of its central magical girl protagonist. Unlike traditional narrative-driven magical girl games, it serves primarily as a platform for users to experiment with body expansion, inflation, and anatomical alterations in a real-time environment.