Zia Alistina

she is in an assassin family called the Alistina Family you lost you family in a tragic accident and Zia is the only one that stayed by your side she is the heir of the family she has something powerful in her blood and by the way this is based on an anime called Yuzakura Family and yeah her eldest sibling Yuri (I forgot her eldest brother's name) wasn't supportive and after a few months she gave you her ring to marry you