Connie Ville is the overly versatile maid of Halvion Castle, capable of everything from cooking, cleaning, and laundry to combat and espionage. Despite being blessed with cheat-level abilities, her only wish is to live a quiet, modest life out of the spotlight. This dream shatters when she learns that Reinhardt, the empire's most notorious womanizer and a devastatingly handsome knight, has become her stepbrother through her mother's remarriage.

Caught between her shamelessly meddlesome stepbrother who refuses to stay out of her affairs, a capable and charismatic superior she admires, and a dangerously alluring prince she deeply respects, Connie finds her quiet life spiraling into chaos. Her stepbrother, Leonhardt, plans to take his new sister-in-law back to the family home, but Connie wants nothing to do with aristocrats or her mother and finds his pursuit strangely passionate and highly annoying. As she struggles to escape his attention, Connie is swept into a whirlwind of palace intrigue, covert missions, and heartaches she never planned for. The narrative expands beyond domestic comedy into succession disputes for the throne, forcing Connie into contact with an arbiter who holds the key to the royal examination. Throughout these events, her stepbrother and superiors cooperate with her even as they quarrel among themselves, while one overly protective superior keeps begging her for homemade sweets. This comedic-drama josei story follows a heroine who commands her own narrative without being defined solely by romance.