My Stepmom's Daughter Is My Ex

Alternate Titles

継母の連れ子が元カノだった
Mamahaha no Tsurego ga Moto Kano Datta

Synopsis

Mizuto Irido and Yume Irido used to date in junior high school. They flirted, had disagreements over trivial things, and became more frustrated than infatuated with one another. Then, after graduation, they broke up. With his failed relationship behind him, Mizuto is ready for the new possibilities high school will bring, so imagine his surprise when he finds out that Yume is not only in the same class as him, but thanks to their parents marrying, they’re now step-siblings!

Background

My Stepmom's Daughter Is My Ex started as a light novel series written by Kyosuke Kamishiro and illustrated by Takayaki that began serialization online via Kakuyomu in August 2017. The following year, Kadokawa Shoten picked up the series and began publishing volumes under their Kadokawa Sneaker Bunko imprint in December. As of February 2022, eight volumes have been published. The novel is also licensed for English release in North America by J-Novel Club, who are publishing it digitally.

A manga adaptation by Rei Kusakabe began serialization online via Niconico Seiga in May 2019 as part of the Dra Dra Sharp and Dra Dra Flat brands. As of May 2022, five collected tankobon volumes have been published by Fujimi Shobo.

A TV anime adaptation was announced in July 2021. It is being produced by project No.9 and features Shinsuke Yanagi as director, with Deko Akao handling series composition and scripts, Katsuyuki Sato handling character designs, and Hiromi Mizutani composing the music. The anime’s opening theme song is "Deneb to Spica" by the idol group Dialogue+, and the ending theme song is “Futari Pinocchio” by harmoe. The anime will premiere in Japan on July 6, 2022 on AT-X and Tokyo MX.

Characters

Mizuto Irido (Voiced by: Hiro Shimono)
Mizuto is Yume’s ex-boyfriend. He and Yume split up when they graduated junior high school, but soon after his dad and Yume’s mom remarried, making them step-siblings. He is a student in Class 1-7 at Private Rakuro High School.

Yume Irido (Voiced by: Rina Hidaka)
Yume is Mizuto’s ex-girlfriend. In junior high, she was a plain, shy girl whose only friends were books, but she successfully made her high school debut as a beautiful honor student. Her maiden name is Ayai. She is a student in Class 1-7 at Private Rakuro High School.

Akatsuki Minami (Voiced by: Ikumi Hasegawa)
Akatsuki is a classmate of Mizuto and Yume’s. She is a bright and vivacious girl who is cute and small.

Kogure Kawanami (Voiced by: Nobuhiko Okamoto)
Kogure is a classmate of Mizuto and Yume’s. He is a genuine worldly person who is easy to get along with and can fit into any group.

Isana Higashira (Voiced by: Miyu Tomita)
Isana is a loner girl and a light novel otaku. She hits it off with Mizuto over their shared interest in reading light novels, and they spend their time after school together in the library. She is a student in Class 1-3 at Private Rakuro High School.

Music

Opening Theme Song: "Deneb to Spica" by Dialogue+
Ending Theme Song: “Futari Pinocchio” by harmoe

• Anime Site (Japanese)
• Twitter (Japanese)

• Original Creator: Kyosuke Kamishiro
• Original Character Design: Takayaki
• Director: Shinsuke Yanagi
• Series Composition/Script: Deko Akao
• Character Design: Katsuyuki Sato
• Sound Director: Yayoi Tateishi
• Sound Production: Bit Grooove Promotion
• Music: Hiromi Mizutani
• Music Production: APDREAM, Pony Canyon
• Production: Toyota Todoroki (Dream Shift)
• Animation Production: project No.9