Sonozaki Akane (園崎 茜) is the eldest daughter of Sonozaki Oryō, the current head of the Sonozaki family. She fell in love with an outsider yakuza boss who was not selected nor approved by the family. When Oryō rejected their union, Akane rebelled. Both enraged, they settled the matter in a spectacular kendo styled sword fight. However, Akane was later forced to peel off her fingernail as restitution, and lost the right of inheritance to the family as a result of the outrageous event. She soon gave birth to twin girls, Sonozaki Mion and Sonozaki Shion, and the right of inheritance fell to the eldest of her children, "Mion." As is eventually revealed in the Sound Novel, manga, and anime, Mion and her sister Shion changed places prior to the ceremony where Mion would receive the demon tatoo in