Shiemi is the daughter of the woman who runs an Exorcist-only shop. She is kind and has an abiding love of gardening, but often lacks confidence in herself. Before the series, Shiemi never went out of her home and tended to the garden with her grandmother. After her grandmother died, Rin and Yukio exorcised the demon that was leeching her life force and she decided to become an Exorcist.
Shiemi is close to Yukio and Rin, and on amicable terms with Ryuji, Konekomaru, and Renzo. She was devastated when she discovered Rin and Yukio hid that they were sons of Satan, taking it to mean that she was not trustworthy. However on the Kyoto mission, she reconciled with Rin when he was imprisoned and joined with his other friends to help him escape. She is also friends with Izumo despite how Izumo initially used her. Shiemi has the talent to become a Tamer and can summon a reliable Greenman spirit that can produce healing herbs and barriers. She is currently an Exwire.