Chifusa's sibling, whom she initially admires greatly. He is the chief Manyuu Breast Inspector because of his great, natural ability to analyze them. It is because of this job that he despises large breasts, ever since he claims that after years of staring at and analyzing them, he has grown tired of them.
Muneyuki wears a blue overcoat, with a black kimono top and a grey hakama.
After Chifusa's defection, his darker side comes up, revealing that he is as ruthless as his father and is willing to go to brutal lengths to preserve the Manyuu rule.
- It is implied that he is either in love with or holds certain feelings for Ouka Sayama.
- He and his younger sister Kagefusa Manyuu had the same mother, Juchini, who was the wife or concubine of their father, Munenori Manyuu.