Yamiko Hinata. She is Ema's big sister. Actually she is not your normal girl. She was actually the opposite of Ema. She is tough,cocky, and very mysterious. On her former school she was known to be Akuma Kaichou and Captain of the Schools Kendo Club. She was feared yet respected. But behind the strong and tough personality a depressed,sorrowful,lonely and broken heart lies. But in twisted fate her Father Rintarou Hinata a famous Adventurer was married by a famous Tycoon Business Woman, named Miwa Asahina. And viola!! In Flash of lightning she had gain 13 siblings!!. 13 brothers. And due to some emergencies she cannot attend their wedding. So she promised she would attend their anniversary instead. 1 year had passed and all most all of the brothers are in love at Ema and this current time. Yamiko is finally going to her new home. What would be the brothers reaction if they meet their imuto's opposite sister?