Munou Nintei de Boukensha Kubi ni Natta kara Jimoto ni Kaette Kekkon suru: Kekkon Aite ga Sekai wo Horoboshikaketa Ryuuou no Musume de Ore no Nouryoku ga Kakusei shita

Judged for having no chance of getting a skill, Alex gave up on his dreams of becoming an adventurer and put his days in a guild behind him. Upon returning to his hometown, he was approached by his childhood friend, Heroine Nadja, who proposed her hand in marriage. The two then decided to spend the rest of their lives in peace. But then, a flock of monsters attacks their town...

(Source: Shinchosha, translated)