Keiko Imoto is a Japanese voice actress and narrator from Fukuoka Prefecture, born on January 8. She is affiliated with the talent agency Aksent, having graduated from its attached training school, Aksent Shine, as part of the fourth generation of students. Early in her career, she worked under her real name, Keiko Imoto, before officially adopting the stage name Kei Imoto in February 2011. She has also been credited under the pseudonym Yamada Hana for adult content.

Imoto is best known for her role as Setsuna Kiyoura in the 2007 anime television series School Days. She reprised this character in several subsequent works related to the franchise, including the OVAs School Days: Valentine Days and School Days: Magical Heart Kokoro-chan, as well as in video game adaptations such as School Days L×H and Island Days.

Her other anime credits include guest roles in television series such as voicing students in D.C. II ~Da Capo II~, a daughter in Ninja Rantaro, and a colleague in My Love Story!!. Her work also extends to original video animations, where she voiced Honoka Sawada in Hori-san to Miyamura-kun, and to radio dramas, digital comics (VOMIC), and drama CDs. Beyond animation, Imoto has contributed her voice to foreign language dubs, including work on CSI: Miami and The Two Princesses, and has appeared in commercials for companies such as Alico Japan and Yamaha. Her personal interests include listening to music, reading, and writing letters, and she possesses skills in swimming and body talk.