A question about a recipe: YaYa's Yakitori

I have a question about step 1 on the recipe "YaYa's Yakitori" from ibbeachnana. It says:

"Warm 1/4 cup sake, 2 Tablespoons soy sauce, fat piece of ginger 1 ½ inch or so, peeled, sliced, and 4 teaspoons of sugar until the sugar dissolves, just a couple of minutes and add a pinch of Japanese pepper. Cool to room temperature and add halved chicken livers to only half of the marinade, marinate for 4-6 hours. Reserved marinade is used for basting the skewers. I’m funny about the basting sauce over the plated Yakitori so I make even 1/3 more for a final brush (clean brush) over the plated Yakitori.

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Where do the chicken livers figure in the recipe? I don't see them in the ingredients list.