Rukuku, the Chief Medic of the Zemomo Platoon, is something of a lesbian heartthrob—however, she is also deeply afraid of commitment and terrible with relationships, so naturally she's left a lot of broken hearts in her wake. Seven of these exes have decided to unionize and enact their sweet revenge. From left to right, we have Hydradra the plant hybrid, Hachichi the bee warrior, Mintete the candymaker, Junono the scorned bride, Fumeme the perfumer, Moiroro the perky goth mortician, and Momon who is the sole non-Keronian one.
The ex timeline, if you're curious:

• Mintete (said she'd be her valentine in elementary school but didn't)
• Hachichi (dated for a week in middle school)
• Fumeme (Dated in high school, but Rukuku ditched her to join the Keronian army and broke up with her over letter)
• Junono (left her at the altar on their wedding day)
• Momon (one-night stand that Momon thought was something more)
• Hydradra (thought she found the one, but then accidentally turned her into a plant hybrid in a desperate attempt to save her life and Hydradra called it off)
• Moiroro (got with her to try and get over Hydradra. It didn't work)