BOYMEN AREA KENKYUSEI

 (ボイメンエリア研究生; Boymen Area Research Students) or BAK is a general term for groups formed in various parts of Japan as a regional version group of BOYS AND MEN Kenkyusei. They're divided in four areas: Nagoya, Tokyo, Osaka and Fukuoka.

Boymen Babys is a group consisting of elementary and junior high school students. Although they're considered to be one of the area research students it's rare they work jointly with other areas.

Nagoya Kenkyusei (BNK)
Area color is. Formed on November 19, 2017.
 * Furukawa Rui (古川流唯) (Founding member)
 * Ishida Yuya (石田侑也) (Joined December 29, 2019)
 * Kato Sora (加藤青空) (Joined December 29, 2019)
 * Tanaka Towa (田中永遠) (Founding member)

Tokyo Kenkyusei (BTK)
Area color is. Formed on December 7, 2017.
 * Takagaki Hiroyuki (高垣博之) (Founding member)
 * Kunimura Ryoga (國村諒河) (Joined February 1, 2018)
 * Nakajo Nozomi (中条望) (Joined December 29, 2019)
 * Seki Yuki (関優樹) (Joined December 29, 2019)
 * Setsura Kuken (設楽賢) (Joined December 29, 2019)

Osaka Kenkyusei (BOK)
Area color is. Formed on November 23, 2017.
 * Takahashi Makaha (髙橋真佳把) (Founding member)
 * Utsumi Taichi (内海太一) (Founding member)
 * Oka Yamato (岡大和) (Founding member)
 * Nakashita Yuki (中下雄貴) (Joined February 2020)

Fukuoka Kenkyusei (BFK)
Area color is. Formed on November 11, 2017.
 * Kotsuji Iori (小辻庵) (Founding member)

Boymen Babys (BBS)
Formed on December 15, 2017.
 * Omagari Sorato (大曲空翔) (Founding member)
 * Tanaka Riku (田中碧) (Joined 2019)
 * Maeda Hiro (前田日彩) (Founding member)
 * Maeda Minami (前田南) (Founding member)
 * Yanagawa Shoma (柳川翔馬) (Joined 2020)

Former Nagoya

 * Shinogaya Ayumu (篠ヶ谷歩夢)
 * Suzuki Masamune (鈴木政宗)
 * Hashimoto Takeru (橋本岳龍) (withdrew August 2019)
 * Nakamura Koki (中村皇紀)

Former Tokyo

 * Kato Kakeru (加藤翔)
 * Kato Fuki (加藤楓季)
 * Kitade Ryusei (北出流星)
 * Taguchi Keiya (田口馨也) (Founding member; withdrew early 2019)
 * Narita Michiyuki (成田道行)
 * Hisakado Taiki (久門大起) (withdrew September 2020)
 * Yujin (結神) (Joined spring 2020; withdrew January 2021)

Former Osaka

 * Ueda Reon (上田怜苑)
 * Okata Rin (大片凜)
 * Saeki Ryu (佐伯龍)
 * Murakami Naoya (村上直哉)
 * Naito Taiyo (内藤大耀) (Joined March 21, 2018; graduated April 12, 2021 )

Former Fukuoka

 * Saeki Takahiko (佐伯孝彦)
 * Taguchi Kyoya (田口恭也)
 * Takemoto Yusuke (武本悠佑)
 * Hanai Yuki (花井優樹)
 * Yoshida Reiya (吉田玲哉)

Units
Kirakira★Senbatsutai (キラキラ★選抜)
 * Takahashi Makataka
 * Furukawa Rui
 * Utsumi Taichi
 * Ishida Yuya
 * Kotsuji Iori
 * Nakashita Yuki

Former Members
 * Yujin

Singles
 * [2020.07.18] Shall We Kiss?

Albums

 * 1) [2021.04.29] Colorful Diamond (カラフルダイヤモンド)

Singles

 * [2020.05.10] Muteki no One Way Road (無敵のOne Way Road)
 * [2020.12.23] GULLIVER BEAT (ガリバ→BEAT!)