Sophia acts as personal maid to Faye Carver in the Carver household. She possesses lilac or purple hair cut to neck length and brown eyes, typically wearing a revealing maid uniform distinguished by a traditional apron over it, setting her apart from other staff. Her appearance suggests a teenage age.

Having grown up alongside Faye and John on the estate, Sophia shares a deep, longstanding bond with both. Her connection with Faye surpasses a typical servant-mistress dynamic, defined by mutual affection and intimacy. Faye consistently addresses her as "Onee-sama" (Big Sister), reflecting their closeness despite class differences. Sophia demonstrates quiet loyalty to Faye, fulfilling personal requests like caring for John during Faye’s absences.

Sophia engages in consensual sexual relationships with Faye and John, often in group scenarios. Her initial intimate encounter with John occurs at Faye’s explicit request for her to "take care of him," rather than purely from personal desire. These encounters typically involve mutual enjoyment among all three.

Her duties include regular work in the mansion and stables. During one stable task, she has sex with John while Faye observes, an act witnessed by Faye’s father Michael Carver, compromising their privacy.

Near the story’s conclusion, Sophia accompanies Faye to Lord Mark’s mansion under coercion. There, Lord Mark rapes her off-screen, conveyed through her facial expressions and vocal distress. This incident concludes her known narrative arc, as the planned second OVA episode exploring further consequences was never produced.