D4DJ ("D4" is short for "Dig Delight Direct Drive") is a project by Bushiroad, the team that brought us BanG Dream! and Revue Starlight. It features a compelling story by BanG Dream! creator Kou Nakamura, and music pieces produced by Shigeru Saito (The Disappearance of Haruhi Suzumiya, Sound! Euphonium).