Kiss×sis, also called Kiss Sister, tells the story that Keita, who lives in Zhijiang, is a junior high school student. She is versatile in sports, but she can't learn it. He lives with two unrelated twin sisters-freshman Jiang Yaxiang and freshman Suminoe Riko. Although he didn't like the positive temptation of his sisters at first, he was gradually attracted by them and got closer and closer to his two sisters. Keita developed a love triangle by being dependent on her eager sisters several times ... Keita's parents also encouraged her son to choose one of her sisters to marry her, and Keita lived an enviable life in such an environment.