来ヶ谷唯湖, Lizbeth, Anego, Yui-chan
Height: 170 cm Yuiko is Rikis classmate who has a selfsufficient personality. She is sometimes seen carrying a replica of a katana. She is seen as an older sister to everyone despite being the same age of almost the entire cast and is referred to as Anego elder sister by Haruka. She is fond of things or people she considers to be cute such as several of the female cast of characters. She gets high grades in school and is especially gifted in mathematics. She was born outside of Japan but is still entirely Japanese. She was given the birth name of Elizabeth which would often be shortened to Lizbeth as a nickname but does not share this as she prefers to be referred as Kurugaya.