Youko Tsubaki

Acting as a devoted parental figure following their mother's passing, this dedicated elder sister prioritizes raising her younger brother above all else. She has even vowed to remain single until he successfully completes his education and secures stable employment. While she spends most of her days managing the household, she often feels deep concern regarding her brother's increasingly erratic and peculiar behavior, which stems from the lingering effects of Urabe's saliva.