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Hexador In reality, yeah, forcing this kind of dramatic change on someone is absolutely horrifying. In no way should this be taken lightly. I think this story does still work, but it requires its very specific circumstances. First of all, Mahiro very clearly trusts and looks up to Mihari to a very high degree even prior to the story's start -- so when Mihari staged an intervention regarding his current dysfunctional lifestyle, his impulse wasn't to fight it. He's also working under the assumption he'll be turned back eventually. Presumably -- it seems to be over a month since the change happened so it is curious why he hasn't asked Mihari for an update as to how long her experiment needs to go.
I think what's important to realize on the topic of whether Mahiro counts as transsexual is how functional he even was in the role he had before. Throughout most of the second chapter where he's exercising with Mihari, he's reflecting on just how inferior and worthless he's felt -- there's an air of resignation and desperation the tone. He's clearly going along with trying out the role of a little sister because he was dysfunctional in the role he was born and raised into. I think it's dangerous to prematurely come down with a trans label one way or the other on people who are in that experimental stage because it can encourage people not to "sandbox" role changes. (i.e. having to commit to a binary identity up until the moment you switch binary roles) The biggest indicator as to how damaged Mahiro's sense of identity even was before the transformation is how much he clings to "home security guard" as a way of not completely losing faith in himself.
Ultimately I'm in 100% agreement with you that what Mihari did to Mahiro, in a vacuum, would be absolutely horrifying. And it's unlikely to go as well as it did in this story. It's only working out because of relationship circumstances that existed prior to the story's start (the trust he had for her) and Mahiro's own prior dysfunctional identity and inability to function in society. To a degree it's OK for a very trusted family member to stage even dramatic interventions. Sadly this latitude is often abused
against LGBTQ+ young people (i.e. to send them to conversion therapy camps) so I can understand the alarm bells going off. But ultimately if the above extenuating factors are taken into consideration, I don't find this story as unrealistic as it might seem at first glance.
Mahiro does seem to be taking to the new role increasingly well -- one reason I love reading this manga is because I'm curious how their identity will develop. I'm hoping Mihari ultimately will leave it up to her brother to decide who they are once Mahiro is truly functional again. (i.e. bathing regularly, not afraid of going outside, maybe even able to pursue a job, etc. )