Kaizensei Altruism

 (蓋然性オルトイズム) is an idol group formed in December 2020 by ONEtoONE Agency and includes former members of TEARS.

They debuted on February 1, 2021.

Current Members

 * Makise Yumi (牧瀬裕美)
 * Tsuji Kaho (辻海帆)
 * Asahina Nana (朝比奈なな) (Graduating June 20, 2021)
 * Shiraishi Neon (白石ねおん) (Graduating June 20, 2021)
 * Kawashima Arisu (河島有寿)
 * Tachibana Ui (立花憂衣)
 * Mizuue Saki (水上咲)
 * Kururugi Maho (枢木まほ)

Former Members

 * Nagatsuki Yuuki (長月優希) (Withdrew May 26, 2021)