片岡 優希

Yuuki is a first-year student at Kiyosumi High School. She has been friends with Nodoka since middle school. Yuuki deeply loves tacos and any food with a name similar to taco, even to the point where she chose to go to Kiyosumi simply because the cafeteria sells tacos. She likes being a comedian, especially when she interacts with Kyoutarou Suga. espite being a first year in high school, Yuuki is very child-like. She seems to be obsessed with Nodoka's large breasts and wants larger ones herself. She is flirtatious towards Kyoutarou; whether this is because of an actual attraction or because she likes to poke fun is unknown. She is also protective of her friends: during the nationals when the media says that the Nagano prefecture has been dropping in power, she gets angry because she feels that they are making fun of her friends and she vows to make them pay.

Yuuki's main ability is to be very strong in the East wind of every game, often jumping out to huge leads against her opponents. She can supplement this with what she refers to as "taco power" by eating her favorite food, tacos - or in a pinch eating something with taco in the word such as takoyaki (たこやき) which can partially increase her ability. However, since competition games are hanchans (East and South winds), she often struggles in the south wind usually giving back most if not all of her gains.