"<i><b>I wonder if everyone's doing dirty stuff already...</b></i>" Wonders Uchiyama Tsuzuri, a bookworm who eavesdrops on her classmates' affairs and writhes in agony. One day after school, Tsuzuri is approached by her playboy classmate, Shouki. At first, she is confused as to what to say and do. But her curiosity leads her to become more and more daring...