I've loved Dear My Teacher since it was first released like 10 years ago and eagerly awaited each irregular release. It felt so sad to know that such a talented mangaka was unserialised and had to publish as doujinshi.
I come back to the manga scene after many years to find that she's been serialised!! And this is the series, called Failed Princesses. And it's even licensed in English! (I feel so bad that i'm reading the scanlations, I want to support this author directly, I'll find a way one day)
Now, unfortunately this is not as good as Dear My Teacher, which I rate a 10/10 or at least a 9.
But it is decent! The resolution feels a tad bit rushed, I wish it went for a couple more chapters so Kurokawa's issues could've had more time, but overall it's a solid series where I can't find much to criticise.
The characters aren't the best people, but they weren't intended to be. (I mean Iro and Izumi are, but not the MCs). And that does leave room for character growth, where by the end of the series they are both better people than they were at the start, thanks to the influence of each other, even if they're not 'great' people.
Ajiichi-sensei made a good work, with great depth to its story, atmosphere and even characters, though less so.
And my GOD, her art is STILL INSANELY GOOD!!. Bumps it from a 8->8.4
The colour pages are like a gift to the reader, I swear, you can really feel it.
edit: Remember to read the doujinshi SECOND epilogue that takes place shortly after the first epilogue (the first being the one that is included in the published book). You might find it under the name "Dekisokonai no Himegimi-tachi - Dekihime no Usui Hon (Doujinshi)" or "Failed Princesses - Useful Princesses Thin Book (Doujinshi)" or "Useful Princesses Extra Edition 3"