Hajimete Ga Ii No [English], by Kakao
(11 votes, average: 4.18 out of 5)
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We’ve got the full combo here: tsundere, twintails, childhood friend =)
What else should I add? A highschool girl awkwardly ensures the boy she loves doesn’t fall first to other women, but things work out in the end? Well, sure, there you go, huhu.
The art was pretty good, for some reason I had the impression the mangaka didn’t have a lot of publications under his belt, it felt fresh, somehow… Additionally, there was only faint censorship, one or two semi-transparent bars apiece, which was nice!
Release credits are for Kuku, Pika, Nepp, Mary-sensei, thank you! 
By the same artist, I also share Koakuma Setsuko No Himitsu volumes 1-2-3-3.5-4-5-5.5 and Onedari Twins.
And now, the download & gallery links 
Open the Complete Pictures Gallery
Download the Free Hentai Manga in a Zip file
(23 MB, 19 pictures, English)
Or you can also use the Alternative:
Zip Mirror #1 – or – Zip Mirror #2 – or – Zip Mirror #3
Granted Azusa really had to drop her guard and make herself vulnerable to finally get together with Souchi … by the end, some elements of “tsun” are still there … but then that’s probably the way we generally like ’em.
This work reminds me in some ways of Chapter 3 (starts at page 58) of this tankoubon by Fukuyama Naoto:
https://www.hentairules.net/2016/09/07/english-ahecolle-tankoubon-fukuyama-naoto/
NOTE: minus Fukuyama-sensei’s “signature” trademark, of course.
Her uniform jacket is great boob camouflage.
The only reason you rarely see kakao publication is because most of them are in Fakku