Yes, I'm a wizard. This time, the magical girl somehow falls into evil (?) It's something like that.
It seems that people have different tastes when it comes to what makes a situation of falling into evil good. Many people place great importance on the point that the heroine is forced to fall, but as a magician, I don't dislike falling of one's own free will, but... I sometimes feel a little out of touch with the world. That said... it's certainly a delicate point whether switching sides for perfectly rational reasons, like "I'm going to get a job over there because the evil organization pays better," can be called "evil descent."
But... is such a fall from evil absolutely impossible? Wouldn't it be surprisingly interesting if you tried it? This is how this work was born after thinking about it in this way.
Also, after watching a certain special effects movie, I thought that the very idea that "one hero/heroine will bear the fate of the Earth" was a kind of madness, and that an ordinary mind could not bear it... It's certainly the hero's destiny, but... if he doesn't like humans that much, he might choose a more realistic path of compromise rather than fighting for his life until the very end.
So, Sakura, the heroine in this case, must have been someone who couldn't believe in humanity that much. It's not detailed what happened in the ten days since her capture, but... in fact, she appears to have been subjected to some form of brainwashing and even direct pleasure training from Adler.
But...the biggest shock to her was the cold-hearted fact that she could not protect the Earth on her own.
Up until now, "invasion" has not been the empire's real goal; even if the empire leaves, it will only be targeted by other forces. No one else can fight the Empire except himself. The police and military are useless, and there is no one to consult. So, what can we do to protect humanity――, and after much deliberation, AdIt was probably about cooperating with Ra's ambitions. Well, it's more like some kind of trolley problem. That decision was made because of her seriousness... but I still twist my head when people ask me if I made the right decision. Well, I understand that it's tempting to say, "If you have a complaint, fight it yourself."
So, in the end, the crucial question of whether "a story about a heroine falling into evil through rational judgment" will be interesting or erotic is up to the reader to decide... but personally, I think it might be possible to be surprised. However...at least the explanation is incredibly tedious, so I wouldn't recommend it to amateurs for now. Let's honestly brainwash them with erotic rays and other things.