I Hate Komiyama is a Manga/Manhwa/Manhua in (English/Raw) language, Josei 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
The one I hated so much, came back cuter than ever…?! Kakeru Komiyama, an ordinary 5th grader, hates his classmate, Enna Komiyama. Despite sharing the same last name, she excels at both sports and studies, while Kakeru is just average. One day, Enna suddenly transfers to a new school, and Kakeru is relieved… or so he thought. Four years later, however, they meet again during a high school ceremony! A heart-wrenching 200% crush childhood friend story!