Help Solving A Manga Problem?

I started reading a manga a couple of months ago and I've forgotten the name :( It was about a boy and girl who crashed into each other on their first day of high school and then pretend to be boyfriend and girlfriend to show to the boy's best friend that there is nothing going on between the boy and the boy's best friend's ex-girlfriend...if you get what I mean. It'd be great if someone could tell me what the name of the manga is! I was really enjoying

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