Kyouka Kusudono Monogatari

Born into a lower-ranking noble family, Princess Kyouka is suddenly thrust into the imperial court to make up the numbers. In a court filled with candidates for empress from high-ranking noble families, she finds herself caught in the middle of a power struggle among the women vying for the young emperor's affection… Princess Kyouka, who aspires to be a pharmacist despite being a woman, aims for a peaceful divorce from the emperor. She uses her medical knowledge to the fullest, incorporating it into her incense and clothing, employing every trick in the book to keep him at bay. However, this escalates into a power struggle among the noble families that engulfs the court—? She fends off the falling sparks with medicine! A Heian-era court fantasy begins, featuring a princess aspiring to be a pharmacist who doesn't aim to become empress! (Source: Kadokawa, translated)