Prince Maker Bride - Raising the Cursed Prince Who Dotes Only on Me

Shail is a princess with a sincere heart that cares for her country, Jupiter, and the strength to control lightning enough to defeat monsters. For the sake of the alliance, she is to marry Prince Tsina of the neighboring country, Marduk, as a political matter. When Tsina and Shail are engaged, she shakes his hand with a shock of electricity, saying, "I don't want this." However, in reality, he is a cursed prince who was raised in an oppressive environment and unable to use magic well.

(Source: Kodansha, translated)