A short girl with an even shorter temper, Yoriko works as the vice president of Korietto's student council. More than anything, she despises being underestimated, and often makes it her purpose to make sure those who do underestimate her live to regret it. Even though she puts up this strong front, she is still flustered easily by words, sometimes causing her to lose her composure altogether.

Despite her appearance, a slightly more mature, deeper voice is what the character would have.