Akuyaku Onzoushi no Kanchigai Seija Seikatsu

is a Japanese light novel series written by Kinome, with illustrations by Herigaru. The series began publication on April 10, 2023 by ASCII Media Works under their Dengeki Bunko publishing imprint.

Synopsis
When ex-girlfriends gather, youth begins to move!? Hiroki Hashima, a high school student, used to date her childhood friend Miyu Mizusawa, but they were estranged after breaking up three years before her. After that, Hiroki had another connection, but that was already a story of the past. Now, she had no regrets and was spending it positively as a good memory. However, one day, when Hiroki finds out that Miyu is dating another ex-girlfriend, she gets involved in an unexpected situation! "It seems that all the former girlfriends full of regrets have gathered and are planning something...!?" "--I want to start over." A single word of temptation pulls in a relationship that should have ended... This is a special romantic comedy that will make you faint in agony, starting over with your ex-girlfriend!