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 is not on the curriculum when she becomes Kiriya s center of attention, as well as embittered Yuka s bulls-eye on her dartboard of hate