Moto Akuyaku Reijou to S-kyuu Boukensha no Honobono Machigurashi: Fuguu na Chara ni Tensei shiteta kedo, Risou no Bijo ni Nareta kara Plus-Minus Zero da yo ne @comic

"I'm pretty amazing, you know?" "With me, you'd be even more powerful." The pair that has it all have an S-rank adventure and romance! An isekai rom-com! Alicia is a haughty duchess who likes to cake her face with makeup. On the night before her banishment for bullying the heroine, Alicia remembers she is a villainess in an otome game... While feeling at a loss, she realizes something else. She has big breasts, good looks, and magical powers?! Who knew she was a triple threat! An idea dawned upon her, and she sought out her nerdy brother to be his assistant to research magical tools. Alicia displayed her talent and soon longed for a life of fun and freedom, rather than the strict upbringing of a queen. In the end, Alicia decides to live her life as a commoner... And she gets teased by the S-rank adventurer, Hayato?! An isekai rom-com with an S-rank adventure and romance! (Source: NTT Solmare)