My Stepmom's Daughter Is My Ex (継母の連れ子が元カノだった, Mamahaha no Tsurego ga Motokano datta, lit. 'The Stepmom's Child Was the Ex-Girlfriend') is a Japanese romantic comedy light novel series written by Kyōsuke Kamishiro and illustrated by Takayaki. The series began serialization on the online novel website Kakuyomu in.