Genjou, Kuki

Sakuragi's honey; Kuki is very smart and clever. He is a highly competent honey and frequently offers advice to Yuzuru. Kuki remains deeply loyal to Sakuragi, vowing to do anything for his master. He never cuts his long hair because he refuses to remove the strands that his master (Nayuta) once touched. Since he is bad at tying his hair, his master helps him.
(wikipedia)