Honoka, the sweet and clingy heroine, has always been close to her older brother figure, Kai. One night, she visits Kai, who is busy preparing for his university entrance exams. Despite being brushed off due to his study commitments, Honoka is determined to get his attention. As the story unfolds, glimpses of their shared past and moments that test their bond as childhood friends are revealed, filled with heart-fluttering scenes.