Houkago (“After School”) [English, 222 pictures], by Iori Yuzuru
(33 votes, average: 3.58 out of 5)
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Here’s an excellent vanilla hentai manga, made of an almost (save an unrelated last chapter) full-volume scenario, served with rather pleasant old-school art style 
The main story features a highschool girl falling in love with her young male biology teacher. Of course they end up having sex on multiple occasions, but there was a slightly realistic note here, as they didn’t rush straight into marriage twenty minutes after their eyes met.
The male teacher had reservations about taking advantage of a teenage girl’s first feelings of love. She’ll lack self-confidence, she’ll be impressed by the adult’s figure of authority, she’ll be inexperienced with controlling her emotions, taking all that into account, it’s not so surprising he would push her back…
But fear not, it’s full vanilla, it’s just there’s a proper amount of character development (you know, growing into a better person) ^^
Graphically, it felt like reading a shoujo manga, or an hentai manga released in the early 2000s. You felt the mangaka’s love for the characters, each panel felt unique, I didn’t hate it :3
Well, I hope you’ll love the read, thanks a lot to SquigglesJP! 
And now, the download & gallery links
Open the Complete Pictures Gallery
Download the Free Hentai Manga in a Zip file
(118 MB, 222 pictures, English)
Or you can also use the Alternative:
Zip Mirror #1 – or – Zip Mirror #2 – or – Zip Mirror #3
I somehow sympathize with the ex-girlfriend when she expressed her frustation about the male lead’s behavior towards his job. The male lead’s response was also very frustating as it was an indirect insult to the ex-girlfriend’s concern, something like “you can say whatever you want I don’t give a damn.”
It may be the ex’s fault for not understanding the male lead’s situation, but she did not deserve to receive such an attitude like that.
I think it’s no accident that the very first representation we had of her, was of her dominant and reprobating side (cleaning his room without asking, throwing blame and moral guilt at him), she *had* to be painted under poor light.
Still, the mangaka made no excuses for the male MC, his flaws were real, and the way I perceived it, the first GF was simply not suited for helping fixing them, it required elements and skills she didn’t possess. How to say… she was his equal if not his better, while to get out of his slump and flaws, he needed to be pulled, not pushed. To realize he could and had to become a better person, what he needed as a partner who was even more insecure than him, who had even less reason to feel confident, who possessed no moral ground to lay blame on him… Well, it worked, in the end, but yeah, it sucked for the girl, she fell for the wrong man.
Foamy crotches and squishy faces, I’ll pass.