This is the old fashioned standard pan-roasted chicken that has been sold by butchers and in department store food halls for years. It's easy and delicious.
This is the pan-roasted chicken that I've been eating since I was a child. My mother used to roast it in the oven though.
Since the chicken is cooked in the sauce, it won't be undercooked, and anyone can make it easily. There's no need to be too concerned about the cooking time, but just make sure not to let it burn.
Enjoy Japanese food around the world.