DO NOT LET THAT COVER FOOL YOU!
There's this idea that hentai manga is only good for one-hand exercises and nothing else. Not only this manga shatters that, it far exceeds into an actual good drama.
Story mainly revolves around a female teacher and a delinquent sort of student boy who have known each other for a very long time, and the teacher always buggers him into improving his way, while the student scoffs it like it's nothing.
Nothing every comes out of it, but they love doing that just because they want each other presence.
Slowly and surely, their bickering slowly turns out into actual love. But, lady with a younger guy? Will people accept that?
They love between them is so organically developed that the sex scenes don't feel out of place and ACTUALLY MADE SENSE!
In your typical Hentai manga, the characters will hop on each other for no reason.
Also, the final chapter is quite heart-wrenching.
Many romance fiction relies on character tropes which, while making the romance more understandable and help with flow of the story, makes the characters feel less human.
Here, the story starts out with the tropes, but slow evolves them into being actual humans (with motivations and fears), without breaking the pacing of the story.
Not only that, but the side characters too are well thought-out and contribute to the progression of the plot.
I really loved how the artist modeled the faces. It feels a mix between traditional anime/manga and stylistic render of actual human faces. They were quite expressive too.
Rest, however, was quite ordinary, but it didn't need to be all that detailed.
It's a little slow paced (I loved slow paced stuff) than your usual romance. But if you stick with it, it's very rewarding.
TL;DR : "A GOOD LOVE STORY IN MY HENTAI?!"