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1st episode of new anime adaptation of light novel series My Stepmom's Daughter Is My Ex aka Mamahaha no Tsurego ga Motokano datta:

Yume Ayai and Mizuto Irido have recently become step-siblings. Before they were step-siblings they used to date. It seems they broke up at least 1 year before becoming step-siblings.

In the very 1st scene, we see that Yume calls Mizuto as Mizuko-kun and Mizuto calls Yume as Yume-san.

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Later, they play Kaguya-sama-like games with each other to try to trick the other into not acting as normal siblings. They manage to trick each other at least once each. Now, also once each, when 1 of them gets tricked, they call each other by last name: Irido-kun, Ayai.

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(Ignoring the issue of the presence/absence/choice of honorific...I'll just pretend for now it's the same as 'Himuro (no honorific)' and 'Yukimura-kun' in Science Fell...)

Question: What's the idea here? Is it like, Idk, 'simulating' when they 1st started to have a crush on each other and thus weren't so familiar with each other and so as part of the simulation they would call each other how they initially called each other then?

BCLC
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2 Answers2

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I know nothing about the anime nor the manga, but according to this, it is something like

  • First, they call each other by first names, just like siblings. San/kun suggests that they behave like they just know each other.
  • Yume gets annoyed by being called by first name, and proposes a game where one loses if s/he behaves in the "non-sibling-like" manner.
  • Mizuto takes the strategy of becoming "serious", then Yume is kind of taken aback, which led to calling him Irido-kun
  • Mizuto points out Yume has lost.

About the changing to "Irido-kun", it does mean Yume was stripped off her "looking down/mocking" attitude, more or less in line with the suggested interpretation. About the change to "Ayai", you can understand it in the same way, but calling her by "Ayai" seems original to Anime.

sundowner
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From TheDarkAngel135790 in here:

Yea, it's something like that.

They started calling each other by their given names because it's normal for siblings to do that. To them, it was sign that they have gotten over their relationship and now consider each other step siblings.

But when they were actually dating, they never mustered up the courage to call them with their given names. So they at that time called each other Irido-kun and Ayai-san.

But in this scene (which i presume is the scene where Mizuto pushes down Yume) Mizuto is all but ready to throw away his identity of a step sibling and revert back to his previous relationship with Yume. That's why he whispers in her ear "Ayai" which can be seen as a sign that he is no longer acknowledging her as his step sister but rather, his ex girlfriend. Yume also ends up calling him "Irido-kun" going with the flow, and also showing she is willing to accept Mizuto's advances

BCLC
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