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BiS, also known as Brand-new idol Society (Shinsei Idol Kenkyuukai, 新生アイドル研究会), is a Japanese idol group founded in 2010 by Pour Lui.

They are considered the flagship group of WACK, and have since had multiple reboots.

There are currently three incarnations of BiS:

The first generation (known as "Original BiS"), was active from late 2010 and disbanded on July 8th, 2014.
The second generation (known as "Reformed BiS") was announced exactly two years after the disbandment of the original BiS by Pour Lui and Watanabe Junnosuke and disbanded on May 11th, 2019.
The third generation is the current lineup of BiS, and was revealed exactly one month after the disbandment of second-generation BiS.

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