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.
Shortly after the introduction of KiLLER KiNG the next round of singles was announced on January 24, 2016. KiLLER KiNG\’s debut single would be \”Kira Kira Smile (キラキラスマイル Kira Kira Sumairu)\”, THRIVE\’s new single would be \”Maybe Love\”, Kitakore\’s new single would be \”Mysterious Kiss\”, and MooNs\’ new single would be \”Brand New Star\”. Unlike the first round of singles the release dates were split into two batches; \”Kira Kira Smile\” and \”Maybe Love\” were released on March 23, 2016, while \”Mysterious Kiss\” and \”Brand New Star\” weren\’t released until April 6, 2016.
On September 9, 2016, it was announced that from December 2016 to March 2017 there would be six consecutive releases, with at least one single from each unit. The releases began on December 21, 2016 with the release of \”Muteki*Dangerous (無敵＊デンジャラス Muteki＊Denjarasu)\” by B-Project as a whole, and \”Hungry Wolf\” by KiLLER KiNG. The next single, \”Summer Mermaid\” by MooNs, was released January 18, 2017. \”Needle No.6\” by THRIVE was released on February 22, 2017, while \”Wonder☆Future (ワンダー☆フューチャー Wandā☆Fūchā)\” by Kitakore was set to be released on February 8, 2017, but was pushed back to March 15, 2017, the same release day as KiLLER KiNG\’s next single, Break it down, for unspecified reasons.
On March 19, 2017, alongside the announcement of the stage play production it was announced that B-Project would be releasing its first album. Two versions were released with different tracklists: S-Kyuu Paradise BLACK & S-Kyuu Paradise WHITE, both albums were released on July 19, 2017. The first song on both albums, \”S-Kyuu Paradise (S級パラダイス)\”, is a new song sung by all 14 members, and each unit also released a new song: THRIVE and KiLLER KiNG on BLACK, and Kitakore and MooNs on WHITE. On June 9, 2017, the album covers were revealed and the titles for the four new songs were announced; \”the one& only\” by THRIVE, \”Blooming Festa!\” by KiLLER KiNG, \”Jikū no Rasen (時空の螺旋)\” by Kitakore, and \”PRAY FOR…\” by MooNs, along with previews for the THRIVE and Kitakore songs.
On September 30, 2017, at the second anniversary event, DARK in the HALLOWEEEEN, it was announced that the anime series would be receiving a second season at some point in the future, as well as announcing the fourth round of singles for each unit alongside new solo songs from all 14 members. On January 28, 2018, at the WINTER of FANTASIA event at Universal Studios Japan it was announced that there would be a new live show in July 2018, B-PROJECT SUMMER LIVE2018, as well as announcing the names and release dates of the fourth round of singles. The first singles released were \”Phantom・of・Love (ファントム・オブ・ラブ Fantomu・obu・Rabu)\” by KiLLER KiNG and \”Ultra-sensitive Destiny (超感デスティニー Chōkan Desutinī)\” by THRIVE which both released on March 18, 2018, followed by \”GO AROUND\” by MooNS which was released on May 16, 2018. \”Crank In (クランクイン Kurankuin)\” by Kitakore and \”Kaikan Everyday (快感エブリデイ Kaikan Eburidei)\” by B-Project which was released on July 16, 2018.
On November 28, 2018, a compilation album containing all the opening, ending and character songs from the first season of the anime, titled B-PROJECT～Kodō＊Ambitious～Compilation Album (B-PROJECT～鼓動＊アンビシャス～ コンピレーションアルバム B-PROJECT～Kodō＊Anbishasu～Konpirēshon Arubamu) was released. On the same day, it was revealed the opening and ending themes for the second season of the anime were revealed, Zecchō Emotion (絶頂＊エモーション Zecchō＊Emōshon) and Hikari to Kage no Toki Musubu (光と影の時結ぶ) respectively.
In total, the series has seen the release of 21 singles, and three albums, with another single slated for release in 2019. In addition to musical releases B-Project also features an anime produced by MAGES that ran during the Summer of 2016 for a total of 12 episodes, a manga written by Morino Mizu that ran for 6 chapters in late 2016 in the monthly magazine Cheese!, an ongoing web-radio series, a mobile musical game, and stage play. The anime was later released in 6 DVD & Blu-ray volumes; volumes 2-6 came packaged with 2 character songs each, 1 song for each unit member who made an appearance in the anime. The series has also seen a variety of special events, all of which have taken place in Japan and usually feature several of the voice actors from the series. These events have usually been to announce upcoming singles or projects, however two have been to celebrate the anniversary of the series. So far the series has seen the following special events: Happy Summer Eastar, KING of CASTE, Brilliant＊Party, LOVE & ART FAMILY MTG 2017, DARK in the HALLOWEEEEN, and WINTER of FANTASIA. For April Fools in 2017 there was an announcement on the official Twitter saying that the B in B-Project stood for baby, this was accompanied by a voting poll for who the fans most wanted to see become an adult again which lasted until April 9. The top 3 ranked characters, Kento Aizome, Goshi Kaneshiro, and Ryuji Korekuni, had limited edition life-sized body pillow covers made as a result of the voting poll. For 2018 April Fools the official Twitter revealed a continuation of last year\’s Baby-Project, known as Kids-Project, which showed the characters as pre-school children.