Rei Ichinomiya is a Japanese voice actress born on January 16, 2005, in Hokkaido, Japan. Her career is marked by a significant leading role that brought her into the spotlight.

Ichinomiya was cast as the protagonist Yoi Takiguchi in the 2026 television anime adaptation of the manga In the Clear Moonlit Dusk. This role is considered her first major break in the industry. The series, which premiered in January 2026, features her in the lead role of a high school girl nicknamed "Prince" who experiences a shift in her self-identity after meeting a senior student.

Prior to landing this starring role, Ichinomiya's experience consisted of minor voice roles in other anime productions. These included small parts in the series Beheneko: The Elf-Girl's Cat is Secretly an S-Ranked Monster! and Duel Masters LOST Tsuioku no Suishō. Her casting in In the Clear Moonlit Dusk, therefore, represents her debut as a main cast member and a significant step forward in her voice acting career. Information regarding her training, agency affiliation, or other notable achievements is not available in the sources examined.