In the story, Mao stuffs the chicken with rice and seasonings, then stews it in rice wine.
So really, it makes sense that Ameya Yokocho is where we bought a jet-black chicken.
Because of the small size of his Silkie, though, Seiji instead decided to slice the chicken and cook it in his rice cooker along with the grains.
In addition to the meat, rice, and necessary amount of water, he also added two tablespoons of sake. In Seiji’s manga inspiration, Mao also stuffs the chicken with seasonings.