If you think about it, in shonen isekai male MCs are relatable but plain, while female MCs are attractive but not always relatable. Now, take a self-insert MC and turn them into a cute girl and you have yourself a gay agenda winning formula!
Fails to be a good revenge story, fails to be a good redemption story, fails to be a good romance...
I have to say, this manga is great at making you wish it was something more.