Coy and self-conscious high school student Karin Karino never paid much attention to boys until she met Kiriya, a popular student from a nearby boys' school. Karin and Kiriya embark on a romantic journey despite Karin's classmate Yuka's best efforts to sabotage their relationship, but Karin soon learns that living happily ever after isn't on the curriculum when she becomes Kiriya's center of attention, as well as embittered Yuka's bull's-eye on her dartboard of hate.

Through a series of chance meetings, Kiriya discovers the exquisite beauty lurking behind Karin's thick glasses and coy demeanor, and asks her to be his girlfriend. But living happily ever after in high school isn't on the curriculum, as Karin soon finds herself the center of Kiriya's attention, as well as the bulls eye in embittered pal Yuka's dartboard of hate.