Okino Kazuki is a normal student who is happy with his staid life. There are two important girls in his life: his sister, Rinka; and childhood friend Sakuragi Otome.
His elder by one year, Otome is a beauty and the dream of every guy in school. Although Otome and Kazuki aren't a couple, they hang out with each other constantly and get along very well. In fact, Kazuki believes that as long as things proceed...