 She has contributed lyrics to some of their songs like "Kimi ga Iru" and "GOLDEN GIRL", which are A-side songs, "Mirai Wakusei" (from "Hajimari no Uta" album), "Tokyo" (from "I" album), and "Shiroi Diary" (from "NEWTRAL" album).Following the release of her first solo single in April 2018, Yoshioka released her first solo album "Utairo" (うたいろ) in October the same year.In September 2018 it was announced that she would be singing "World in Union", the official song for the 2019 Rugby World Cup, being held in Japan.