Hime Nonohara is a 16-year-old high school student and core member of the idol group 777☆SISTERS at Three Seven Studio. Residing with her father, younger sister, and younger brother, she helps run the family's Nonohara Tofu Shop. Following her mother's passing during her childhood, Hime willingly assumed significant household and childcare duties. This responsibility fostered her rough, boyish demeanor, contrasting with the delicate features she inherited from her late mother—short golden blonde hair and blue eyes.

Initially hesitant to pursue idolhood due to her family commitments, Hime eventually joined Nanastar after persistent encouragement from fellow idol Haru Kasukabe and her own family. This choice began her gradual journey toward embracing more feminine qualities, though she consistently rejects any perception of herself as cute or princess-like, creating irony with her name "Hime," meaning "princess."

Her image color is orange within 777☆SISTERS. She also performs in the subgroup WITCH NUMBER 4 as the "Witch of Moonlight," adopting the stage name "HI-ME" and shifting her image color to yellow. Hime enjoys making deliveries for the tofu shop, spending time with her younger siblings, and appreciating evening river scenery. She shares a particular closeness with the similarly tomboyish Sui Kamishiro.

Hime's story development centers on balancing her idol activities with family obligations, showcasing her growth in managing her supportive home role alongside her evolving identity as an idol.