Riria. is a Japanese singer-songwriter who made her debut as an anime voice actor in 2022, providing the voice for the heroine Uta in the Wit Studio animated film Bubble. This role marked her first voice-acting performance, for which she was personally requested by the film's director, Tetsuro Araki, and producer, Genki Kawamura. In addition to her voice role, Riria. also performed the film's ending theme song, Jaa ne, Mata ne. Her involvement in the project extended to the film's opening theme, Bubble feat. Uta, a song created and performed by musician Eve that features her character.

Prior to her work on Bubble, Riria. began building a following as a musician. She started posting songs on TikTok and YouTube in the fall of 2019, amassing a significant social media following. She released her first single as an independent artist in May 2020 and subsequently signed with the Toy's Factory record label under its VIA imprint in November 2020.

Following her acting debut, Riria. has continued to contribute theme songs for various anime series. She performed the opening theme song Anata no Soba ni for the first season of the anime My Happy Marriage in 2023. For the second season of the same series, which began airing in 2025, she provided the opening theme Shiawase na Yakusoku. Her other anime theme song credits include the second cour ending theme Shitsuren Song wo Takusan Kiite Naite Bakari no Watashi wa Mou for Summer Time Rendering, the ending theme Anta Nante for the 2024 anime Ranma 1/2, and the opening theme Aitoka for the 2025 series The Too-Perfect Saint: Tossed Aside by My Fiancé and Sold to Another Kingdom. To date, her voice acting roles appear to be focused on her debut performance in Bubble.