Diphylleia's Plan To Coup summary:

Thao Vy— an 18 year old girl in the spring of her youth, the precious daughter of a bread store owner on Bưởi Street. One night, while studying for her college entrance exam, after eating her mother’s homemade roasted chicken sandwich, she suddenly was transferred to another world?! What do you mean by a new mom & dad? A new biological older sister? An older twin brother?! A ritual? A school for nobles?! A ridiculous situation brought her into a state of sorrow, and from that moment onward, she will have to live in another body, live with another name; Diphylleia de Emboriel — the youngest princess of the glorious Emboriel Empire.