Ema's Sister (Brother's Conflict Fanfic)

Y/N L/N lives at the orphanage until Rintarou Hinata adopted her and became his daughter. Now she is known as Y/N Hinata. She became a vocalist of a band name BLACK N WHITE and they became famous because of their songs. Rintarou gave the news to Y/N that he is getting married again. But wait there's more, after knowing that Ema moved with a bunch of thirteen new brothers?! Y/N planned a surprise visit to her sister and because Ema is a sweet and kind girl, the guys will take advantage of her! Unacceptable!
Y/N will have to sacrifice herself for the sake of her sister. Will this conflict ever end?!