Suppose a Kid from the Last Dungeon Boonies moved to a starter town

Tatoeba Rasuto Danjon Mae no Mura no Shōnen ga Joban no Machi de Kurasu Yō na Monogatari (たとえばラストダンジョン前の村の少年が序盤の街で暮らすような物語)

Lloyd lives in Kunlun Village with his grandfather and older brother. Years later, he travels to Azami Kingdom where he will be staying with the East Side Witch, Marie, while he takes the soldier exam. Marie almost refuses until he produces a magic crystal, which summons his village chief, Alka, Marie's former master. Alka tells Marie to look after Lloyd. Marie learns that Lloyd, who considers himself to be weak, is actually very powerful. Lloyd defeats a monster attacking Selen, a young girl with a belt around her head. Selen reveals the belt was cursed onto her as a child and was told only great strength would remove it. However, after meeting Lloyd, the belt simply falls off, causing her to fall in love with him. Before the exam, Riho, an ex-criminal turned military cadet, senses Lloyd is extremely dangerous. Selen shows extreme jealousy when Lloyd talks to Riho. Marie reveals Kunlun is by a still undefeated dungeon containing the most powerful monsters in the country, so while Lloyd is considered weak by people from his village, he is probably one of the strongest humans in the world. After the exam, Lloyd's name is not listed amongst the candidates.