An Unexpected Appearance

Many people thought that Ema was an only child before she met her new brothers. They were definitely wrong. Ema has an elder sister named Aki.

As children, Aki saved Ema's life from a terrible accident. Thinking that her sister Aki died, she and her father had left to escape the trauma. Ema now living with thirteen brothers gets an unexpected visit from her sister who she thought was dead all these years. Will the brothers fall in love with Aki too now that she's moved in?