Yukino and Kanade Sakurai are twin sisters sharing a dorm in high school. Despite being identical, they often behave like lovers, holding hands and going on dates together. One afternoon, Kanade notices Yukino spending time with a new friend, Sakuya Kamiyama. Believing the pair are romantically involved, Kanade distances herself from her sister. Yukino quickly senses this shift and begs Kanade not to withdraw. In truth, Sakuya merely seeks guidance about Kanade, exposing her obsessive affection. How will this love triangle resolve? Their close bond and shared secrets make the situation even more complicated. Students around them notice subtle shifts in their dynamic.