Satsuki Shiina is a Japanese voice actress and digital idol known for her work within the multimedia franchise 22/7 and for her role in the upcoming anime adaptation of Needy Girl Overdose. She was born on March 27 in Yamanashi Prefecture, Japan. Her career is notably tied to the 22/7 project, where she debuted on February 27, 2022, as a member of the group's second chapter. Within this digital seiyuu idol unit, she provides both the voice and motion-capture performance for the character Sumika Orihara.

Shiina's most prominent and upcoming anime voice role is that of Michika Gokubara in the television anime Needy Girl Overdose, which is scheduled to premiere in April 2026. The character is a member of the original anime unit Karamazov, a group of streamers created specifically for the anime adaptation of the game Needy Streamer Overload. She will reprise this role in the related project Needy Girl Overdose -OVERTURE-. Her other notable screen appearances include performing as herself in the 2024 program 22/7 Keisan-gai and voicing Sumika Orihara in the 2018 series 22/7 Keisanchu. Her performance as Michika Gokubara is part of a cast that includes co-stars Rina Kawaguchi and Seena Hoshiki as fellow members of the Karamazov unit.