My Sister Is the Devil

There are many possibilities in the world. By accident, I met a girl who claimed to be my sister, and something happened between me and her. As time goes by, I realize that the world is not as simple as we thought. What kind of sparks can we create between childhood sweethearts, aloof seniors, or this weird sister? This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.