D4DJ Groovy Mix is a free game available on iPhone developed by Bushiroad Inc. This game is based on the media mix content "D4DJ" that follows the theme of "DJ." With over 600 songs, the game features a variety of music genres, including original songs by the characters and remix covers of famous songs. The game's aim is to connect people beyond gender and age through the power of music.

The game has several cast members, including Happy Around!, Peaky P-key, Photon Maiden, Merm4id, Lyrical Lily, UniChØrd, and Abyssmare. Each unit has its own music producer, and the game features various songs produced by them. The game also uses Live2D from Live2D Inc.

Overall, D4DJ Groovy Mix is an excellent game for those who love music and rhythm games and want to connect with people through the power of music.