Rui is a beautiful and studious high school student. However, because she is so direct, she has often been misunderstood, so now she is the subject of absurd rumors, and alienated by the rest of the girls in her class. Then one day, a chance encounter with a free-spirited guy named Shou turns Rui's meticulously-ordered life on its head.

And so, a "rainbow school daze" between a super dry girl and a care-less guy begins!