Rina Hidaka is a Japanese artist whose musical career is extensively intertwined with anime productions, primarily as a vocalist for character songs, insert songs, and theme songs. Her work is largely collaborative, often performed as part of musical units formed from specific anime casts.

Hidaka's early music credits include the opening theme for the 2008 anime series Penguin Girl. She performed as a member of the vocal group PNGN6 for the song Ren'ai Jiyuu Shoujo♀. In 2011, she became a core member of the vocal unit RO-KYU-BU!, formed from the cast of the anime Ro-Kyu-Bu!. With this group, which also featured Kana Hanazawa, Yoko Hikasa, Rina Satou, and Yuka Iguchi, she performed the opening theme SHOOT! and the ending theme pure elements. She also recorded character songs for the series as her character Airi Kashii. That same year, she performed the insert song Innocent Blue for the anime Star Driver: Kagayaki no Takuto.

Throughout the 2010s, Hidaka contributed to numerous anime music projects. In 2012, she sang the opening theme NO RULE ~ Chō-Listen! for the OVA Moe Can Change!. She performed the song Heavenly Lover for the anime The World God Only Knows. As part of the music group Criticrista, alongside Ai Kayano, Hiromi Igarashi, and Rie Murakawa, she performed the insert songs Hanate! Dododon! and Colorful Snow Drop for the Show by Rock!! franchise. She also performed as part of the unit Altair Torte for the anime Schoolgirl Strikers, providing vocals for the opening theme Mirai Kei Strikers and the character song Okawari Shitai Mystery.

Hidaka is credited as a vocalist for the IDOLiSH7 anime series. In the first season of IDOLiSH7, she performed the insert songs Egao no Tsuzuki and Magical Power. Her song Magical Power was also featured as an insert song in the second season, IDOLiSH7 Second Beat!.

Her musical identity is that of a vocal interpreter for anime characters, bringing songs to life from the perspective of the roles she portrays. Her discography is composed almost entirely of character songs, theme songs for the anime in which she appears, and songs performed as part of cast-based musical groups. As such, her significance within the music industry is directly tied to the anime industry, where she is a reliable and active contributor to the soundtrack and theme-song landscape of numerous popular series.