Minase, Shizuku

水無瀬静久; 黒うさぎ

Arisa's cherished older brother. Although he appears unemotional, seldom starts conversations, and rarely alters his expression, he holds a deep affection for his beloved younger sister and values her above everything else. Their bond has strengthened in the wake of their parents' absence, and he attempts to alleviate her loneliness through gifts and gentle words.
He leads Arisa to her new home as the Black Rabbit. Yet, in this new form, he maintains that he has no siblings and asserts that he does not recognize the name Shizuku at all.