Yukiko Minase (水無瀬 由起子 Minase Yukiko), mainly referred to by her first name Yukiko throughout the series, is a featured in the first and second eroge games and the debut anime series Bible Black: La Noche de Walpurgis. She is also featured in a Bible Black: Only scene. Yukiko is Taki Minase's live-in cousin and legal guardian, but they refer to each other as siblings. She is a friend and neighbor to Kurumi Imari, whom she occasionally asks to cook dinner for her 'brother'.