Yukino and Kanade Sakurai are twin sisters that live together in a high school dorm. Although they are twins, they tend to act romantic toward each other, holding hands and going on dates. One day, Kanade sees Yukino hanging out with a new girl, Sakuya Kamiyama. Realizing how much time these two spend together, Kanade assumes they are dating, and she begins to distance herself from her sister. Yukino promptly notices...