From Aqua Scans:

Once upon a time there was a wonderful prince… A super rich and handsome prince with a genius IQ of 500, extraordinary physical prowess… An outrageously overpowered super star…!! What will happen when this ridiculously overpowered ultra-high spec boy and a certain ultra-level-headed ordinary girl meet…?!

Nima Momosato, who is unusually unlucky with boys, is asked to join a club that observes and researches other people's love lives.

While Mikeno’s classmates gush over the radiant and popular Hoshigami-kun, she’s trying her best to avoid trouble and get along with everyone. However, Mikeno's peaceful life changes when the wrong Hoshigami-kun asks something from her.