Suki na Hito to Hanabi wo Miru Houhou

Mai wants to make a boyfriend at the summer festival... but she gets the lowest grade on the test! In order to get a passing score on her catch-up test and go to the summer festival, she decides to ask Yono-kun, a genius, to teach her how to study. She first thought Yono-kun was scary, but he's really hardworking and kind... and he promises to take her on a date to the summer festival if she gets a passing grade...!?

(Source: Kodansha, translated)