My Stepmom's Daughter Is My Ex
Oshimeter
Synopsis
Back in middle school, Mizuto Irido and Yume Ayai dated, bonded over books, broke up right before graduation, and then, because life has a sense of humor, their parents got married and made them step-siblings. Now they're living under the same roof, going to the same high school, and pretending none of that relationship stuff ever happened. They even set up a 'sibling rule' where whoever acts like an ex first loses and has to treat the other as the older sibling. It's petty, it's stubborn, and it's honestly pretty entertaining to watch two people who clearly still have feelings for each other try this hard to act like they don't. The dynamic works because both Mizuto and Yume are sharp, a little prideful, and terrible at actually letting go. Their bickering has real texture to it; you can feel the history underneath every loaded comment and awkward silence. The 12-episode TV series from Project No.9 keeps things light with solid comedic timing but isn't afraid to let the romantic tension breathe when it needs to. If you liked the messy relationship dynamics of Domestic na Kanojo but want something way less melodramatic, or if Ore no Imouto scratched a certain itch for complicated sibling-adjacent situations, this one fits that niche well. It's a comedic, romantic slow burn where two exes keep tripping over their own feelings while pretending they're just family now.
Episode Guide
Characters
Yume Irido
Yume Irido: Popular high schooler, loves mysteries, and unexpectedly lives with her ex-boyfriend.
Hidaka Rina
Mizuto Irido
Introverted bookworm Mizuto, highly intelligent, unexpectedly lives with his ex-girlfriend after their parents remarry.
Shimono Hiro
Community Feed
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The fanservice gets distracting and kind of ruins the story. Instead of focusing on character growth, it leans too hard into awkward and unnecessary scenes. Easy turn-off if you’re not into that.
Dykf
It was confusing at the beginning, but eventually it became easy to understand. it really lacks something, it can be better tbh
I feel this episode is better than any other episode. It was refreshing and satisfactory. Visuals were good too
This episode was unbelievably horrible, it was cringe, I don't know, but the visuals were good, it can be better
This episode was relaxed and rather satisfying. That was quite surprising, as the series had a chaotic plot before this episode. This was a good one
I don't really understand this series tbh. The story is lacking something, I don't know what, but it really lacks something
The episode shows the backstory of them. Their love story had a lot of misunderstanding and hatred, it was hard for them
I didn't like this episode. I feel this episode has all the unecessary things and also old things was repeated again
That ending was somehow sweet and bitter. The second half of this episode was beautiful. The story was heartbreaking for them, as they knew each other's private feelings it was difficult for them but they did it
It wasn't that exciting an episode for me because there were too many episodes where the plot didn't really change my point of view. I think the visuals were the best part of the anime. It wasn't bad, but it could have been better.
I don't know why, but the episode is getting a bit awkward as it progresses. This episode is so messy. it can be more better
This episode was mostly about the whole siblings-step-siblings-exes game. I really dont understand Yume's character so far; she's like the typical spoiled brat, but she somehow try to act kawaii.
The plot was not so easy to understand, and everything was messy tbh. They all have complicated main characters. Overall, this was a bit of a complex series.
The animation was good, but the plot itself was unusual and that makes it chaotic. The pacing was terrible, and even the characters were unlikeable, especially Mizuto's introverted, cold personality. Overall, not the cup of tea for anyone who has a closed mind.
It wasn't that exciting of an episode for me; maybe I would have liked to see a bit more. I think it wasn't exciting enough because there were too many episodes where the plot didn't really move forward, so by this point, you don't feel that connected to the characters. I think the visuals were the best part of the anime, along with how they explain at the end why Mizuto is so connected to reading. It wasn't bad, but it could have been better.
The best episode so far 😭. Man, emotions are so complicated... romantic relationships, breakups, holding back your feelings. Thank goodness they could have that moment alone thanks to Madoka. I got emotional along with the characters, and that's something that hadn't happened to me in the previous episodes. It's a shame we get such an emotional episode this late in the game. I would have liked to see something like this earlier, but oh well.
You know who I miss seeing? Kawanami. The episodes where he and Mizuto goof around were way easier to watch than, for example, this episode where they are pushing Higashira YET AGAIN . My god, YAMERO haha. Also, the comments the parents were making to the ex-couple-now-step-siblings were a bit uncomfortable. I felt a little cringe during that part.
If they had started the story this way, it would’ve been so much easier to understand what was going on between them, instead of beating around the bush so much. This episode makes everything clear about how their past relationship led to their current dynamic. Instead of wasting time on Higashira in the previous episodes, they should’ve focused on explaining the main plot better. Honestly, I liked the episode; it’s definitely worth watching.
Well... remember all the maturity from the previous episode? Nonexistent here. Once again, they're trying to change Higashira, which I absolutely hate. Why can't they just let her get to know herself at her own pace? It’s so frustrating how they keep interfering with her personality and her relationship with Mizuto. Sometimes Yume makes really spot-on comments, but then she goes right back to being a toxic, possessive, and jealous child. At times I enjoy certain moments of the anime, but other times it’s honestly insufferable. 😭
My Stepmom's Daughter Is My Ex
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