Manga by author Yumi Nakata - Status ongoing

About Kousuke, an athletic and good-natured 15 year old boy with an appropriately healthy interest in girls, and Kanon, a girl who is bad at talking to boys due to immersing herself too much in books but wants to try falling in love.

The beautiful, talented girl who just beat me to become Student Council President, suddenly shows up at my house announcing that we're getting married, because of an old promise between our parents? "No problem, if I just harass her for a bit she'd surely run off" I thought, but she might just be a bit more formidable than I expected.

The official Border School Juliet Anthology.