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.

The age-old dilemma of choosing between your friend and the one you love is the lesson for the day for these bubbly high schoolers. 16-year-old Karin Karino finds herself torn between keeping the friendship of her classmate Yuka and entertaining the advances of a boy named Kiriya. Plain-Jane Karin experiences the gut-tingling roller coaster ride of her first love and first kiss as fate pairs her up with Kiriya, who also happens to be Yuka's object of affection.

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.