Kitazawa-kun Is in A class is a Manga/Manhwa/Manhua in (English/Raw) language, SUGGESTIVE series, english chapters have been translated and you can read them here. You are reading chapters on ManhwaZ fastest updating comic site. The Summary is
Masashi Kitazawa, a sophomore in high school, had a trauma. The trauma is that I was fat when I was a child! Kitazawa, who diligently dieted and worked hard in middle school, grew up to be a handsome man and was supposed to lead a peaceful school life, but... In the new semester of high school, handsome men and beautiful girls have gathered in Kitazawa's 2nd grade class A for some reason. What's more, he received a secret invitation from Ayame Yagyu, the most beautiful girl in her grade...!?