What exactly is love? Or to put it another way, what causes someone to decide that they prefer one person over everyone else? Mishima Rika, a curious high school girl, just doesn't understand the concept, and her boy-crazy big sister is little help.

The boy who sits next to her at school, Kagawa Michiya, is wildly popular with the ladies, so Rika decides to ask him about it. Shockingly, he's also never really liked someone romantically! Together, they begin to hang out more and more, talking about love and other questions that weigh down the introspective Rika's mind. But what exactly does it signify when they suddenly feel awkward around each other, or fall into a blushing silence? Will these two love-blind teenagers be able to finally figure themselves out?