At school Natsuki Saotome is complemented by her classmates, as opposed to Takuma Akutsu. Who easily scares others because of his personalty and nicknamed a "demon." He has a phobia of talking to people. However, arriving at home Natsuki and her sisters, Itsuyo and Mutsumi are living under the same roof as him. Along with 6 other sisters. After dinner, Takuma and Natsuki went to study together, but Takuma tried to find ways to study alone leading into an awkward argument with her...