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 2018 the project features an anime series, a manga adaptation, a rhythm game, a stage play, multiple music CDs, and a range of related merchandise. B-PROJECT follows four (initially three) Japanese idol groups that perform both as separate units and as a whole group. When the project first began the units were: Kitakore (キタコレ), THRIVE and MooNs, but on December 4, 2015, a fourth group known as KiLLER KiNG was added. The first single for the series, "Eikyuu Paradise (永久パラダイス)", was released digitally on September 11, 2015, alongside a promo video for the series and a teaser of a new single, "dreaming time", from THRIVE. It was later revealed that in addition to "dreaming time" from THRIVE, MooNs & Kitakore would also be releasing singles on November 25, 2015, "Glory Upper" and "Koiseyo Otome (恋セヨ乙女)" respectively.