My Stepmom's Daughter Is My Ex
My Stepmom's Daughter Is My Ex, also known as Tsurekano, 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 August 2017, with a print version beginning publication under Kadokawa Shoten's Kadokawa Sneaker Bunko imprint in December 2018. The light novel is licensed digitally in North America by J-Novel Club. A manga adaptation by Rei Kusakabe began serialization online by Fujimi Shobo via Niconico Seiga website as part of the Dra Dra Sharp and Dra Dra Flat brands in April 2019. An anime television series adaptation produced by Project No.9 aired from July to September 2022.
Synopsis
When they were middle schoolers, Mizuto and Yume were a completely normal couple. Between flirtations and shouting matches for minor reasons, the two students stayed together until they entered high school, where they finally decided to break up. What they do not know is that fate sometimes has many surprises in store, and that they will be reunited again as stepbrother and sister only after two weeks.Indeed, their respective parents are about to remarry and the former couple will have to live under the same roof on a daily basis. In order not to hinder their parents' happiness, they accept the situation and decide to put in place the rule of brothers and sisters, according to which the first who feels attraction towards the other loses.
Characters
;Mizuto Irido;Yume Irido
;Akatsuki Minami
;Kogure Kawanami
;Isana Higashira
;Mineaki Irido
;Yuni Irido
;Madoka Tanesato
;Chikuma Tanesato
Production
The first names of Yume and Mizuto come from "oil" and "water", respectively. The surnames of Irido, Ayai, Higashira and Tanesato come from Conan Doyle, Yukito Ayatsuji, Nisio Isin and Ellery Queen, respectively.The author Kyōsuke Kamishiro set Yume and Mizuto's birthday as November 3 since both 11 and 3 are prime numbers, which cannot be "separated".
The location setting of the story had been kept ambiguous since its web serialization. However, after several years, Kamishiro decided to set it in an actual location, Kyoto, since the story in Volume 8 takes place in Kobe.
Media
Light novels
The series began serialization on the online novel website Kakuyomu on August 7, 2017, with a print version beginning publication under Kadokawa Shoten's Kadokawa Sneaker Bunko imprint on December 1, 2018; the series has thirteen volumes as of October 31, 2025. The light novel is licensed digitally in North America by J-Novel Club.In the Blu-ray set of the anime series, an original what-if story titled Mamahaha no Tsurego ga Imakano datta written by Kyōsuke Kamishiro is included. The story is about what if Yume and Mizuto did not break up before they became stepsiblings.