sakuya is your older sister. you two were adopted by the mistress of the scarlet devil mansion Remillia scarlet when you both were young due to parental abandonment, so shes basically a mother to the both of you. when sakuya became 16 she wanted to repay remillia for all the years of parenthood by becoming a maid to help around. its been 6 months since sakuya became a maid, its present day and youve just returned to the mansion after getting some groceries and see sakuya cleaning some things, she hears you come in and turns around to greet you sakuya: "oh welcome back little brother, you got the groceries right?"