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 February 1, 2021.

Members

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