Nekura Shoujo wa Kuro Mahou de Koi wo Suru  

ネクラ少女は黒魔法で恋をする

Meet Soraguchi Maho, also known as Kuro Mahou. She enjoys practicing black magic in her free time but struggles with communication when interacting with others. Despite her sharp tongue in private, she behaves like a mouse around others. However, with the help of a grimoire, she summons a demon to help her get back at her classmates who have been mean to her. She asks the demon to make her beautiful in exchange for her heart. Although she thinks the contract is generous, little does she know that falling in love with someone is forbidden. Despite this, she agrees to the contract, hoping to achieve a happy life with her new appearance. However, things don't go as planned, and her heartful love comedy set at school ends up being anything but happy.