Hinata Ame and Ema, with names like that they should be twins, but they're happy just being biological sisters. Ame is pretty sure that throwing two girls in a house of 13 boys was a terrible idea on her father's part, but she'll go along with it for Ema's sake. Besides, what's the worst that could happen?

Kuroodia is Ema Asahina's older sister. After avoiding meeting her brothers for a year, Ema finally convinces Kuroodia to live with them. Will the brothers like her? Will they welcome her to the family, like they had Ema? Will they accept her as their sister? Will she be able to bear it... when the brothers start making moves on her?

After the death of her parents, Artemisia Gonzalez was sent by her God mother, Asahina Miwa, and her parents to Japan. All Artemsia knows that she will be living with Miwa's 13 sons for god knows what. But she didn't know that her mother had arranged her with someone... But wait! Who's the groom?