An unexpected love starting from an unplanned kiss. Fukami-kun is a smart, good-looking guy who is popular with the girls. But in actuality, he's a disappointingly stubborn boy who refuses to accommodate anyone else's schedule, leading him to be rejected even after being confessed to. One day, a strange girl, Higurashi Akio, is looking for her cat around the school grounds, and the two of them somehow end up kissing by accident. Unlike Fukami-kun, Akio doesn't seem to care about the accident at all. At first, Fukami-kun is irked by her attitude, but gradually comes to hold an interest in the capricious Akio. A youthful love story between a disappointing boy and a strange girl begins.

Is being unable to see the red string of fate better?! Since the encounter on the day of the high school entrance ceremony, dog-like boy, Makita Keita and cat-like girl, Ohara Tamaki have had the worst relationship. The story starts to progress when the both of them are put in the same class. A little mysterious heart racing school youth graffiti begins!