Heimin no Watashi desu ga Koushaku Reijou-sama wo Taburakashite Ikiteimasu

Lilah, a commoner, is kicked out of the house where she grew up and finds herself on the street. But somehow Eva, the duchess, takes a liking to her and she ends up becoming her bodyguard. A fantasy of a commoner's rise to power against the aristocracy begins!

(Source: Cmoa , machine translated)