Negai o Kanaete Moraou to Akuma o Shoukan Shitakedo, Kawaikattanode Kekkonshimashita: Akuma no Niidzuma

Young orphaned adventurer tries summoning the devil to help his career as his own skills are lacking. The devil comes in form of a beauty who offers to grant him one wish. He’s so enamored with her appearance that he asks her the first thought in his mind, to be his wife. She blushingly agrees to his surprising demand to join in his future adventures together.