Koi wo Shita Yuutousei no Akumateki na Henbou ni Tsuite

Elmer Grant, the son of a merchant family, is being harassed at Ramsus Academy of Magic, an elite school where the majority of students are aristocrats. With only one year left of his awful school life, he is forced to confess his true feelings to Jean Aster, the eldest son of the Margrave and hero of the kingdom, after being threatened by the sons of aristocrats! Elmer was prepared for Jean's wrath, but to his surprise, he is approached by Jean with a contract...!?

(Source: Kadokawa, translated)