This wasn't a hugely popular manga, afaik. It did have physical publications, however. It had the atypical setup for a romcom where a popular girl tries to coach an unpopular guy to have better luck with the ladies. The girl has a crush on said unpopular boy. Funny situations occur at each chapter.
To describe how they look, the girl was a bit "ikemen" (handsome) where she dresses somewhat boyish/baggy clothing. And because reasons, she's actually curvy underneath it all. I remember thinking she sort of looks like the Vtuber, Kaela Kovalskia. The boy is relatively not special looking, really. I believe the girl was taller than the boy?
I had this manga on my old tablet before it croaked. I was using the Kiwi browser on it so I couldn't access it anymore. The plot isn't anything special to write home about, but I really thought the art style was cute and had some pretty funny moments (such as having the guy try to smile and he looks relatively creepy trying to do so, and the pair watching a horror movie together in a bedroom with the girl trying not to be scared stiff).