Do Majime Jijo no Konyaku Soudou! Mukuchi na Kishidan Fukudanchou ni Jitsu wa Betabore saretemashita

Sandra, a strict maid, has focused solely on her work and is now at an age where she is considered too old to get married, so she has given up on love and marriage. Everyone around her thinks she is far from ready for marriage, but she actually has feelings for Ian, the vice-commander of the Knights. One day, her younger brother Julius, the youngest member of the Knights' elite unit, asks her to pretend to be his lover to keep away from women. Sandra reluctantly accepts, but Ian sees her pretending to be Julius' lover...! After that, for some reason, Ian cuts his long bangs, shaves his beard, and dresses up in a completely different way...!? And what's more, Sandra receives a marriage proposal from a new man...!? The love story of a clumsy knight and a strict maid begins! (Source: Shueisha, translated)