One summer day, Nakaba Masaki suddenly confesses his love to his classmate, Yuzuki Tsubasa, who happens to be alone with him in the classroom after school. He was already preparing to be crushed by the words that came out of his mouth, but what he received was a shocking answer: “I’ll date you if you want to date my twin sister too.” For a moment, he didn’t know what they were talking about, but he knew he couldn’t back down, so he agreed to date the two of them together. But then, more unexpected events await. Oh!