Living together in a high school dorm, twin sisters Yukino and Kanade Sakurai have a close bond that some mistake for romance due to their affectionate gestures. When Kanade misunderstands Yukino's friendship with the new girl, Sakuya Kamiyama, thinking they are dating, she starts to pull away. Yukino, realizing the misunderstanding, tries to mend their relationship. Unbeknownst to Kanade, Sakuya's interactions with Yukino stem from an infatuation with Kanade. How will this tangled web of emotions resolve in this love triangle?