B-PROJECT is a Japanese cross-media project by MAGES. about a group of virtual idols that began in 2015. The project was first announced via Twitter on August 9, 2015, with the first production presentation and song previews being released on September 4, 2015 via nico live. As of January 2019, the project features a 2-season anime series, a manga adaptation, a rhythm game, an upcoming stage play, multiple music CDs, and a range of related merchandise.
Tsubasa, a new hire in the A&R department of the major recording company Gandala Music, is immediately assigned to oversee the idol unit "B-PROJECT," which is made up of three idol groups: Kitakore, THRIVE, and MooNs. This is Tsubasa's first job, and she gets involved in various incidents and accidents as she deals with this group of young men who each have their own differing personalities.