Teihen Hunter ga [Return] Skill de Gendai Saikyou

Monsters suddenly appear in the world from gates and dungeons, and Yuuki Asuto becomes a hunter who awakens to his skills. However, no matter what he did, his skill wouldn't activate, and it was supposed to be useless. Until he meets his doomed future. By making full use of his skill, which allows him to return at any time after death, Asuto aims to become a stronger hunter than anyone else.

All in order to defeat the worst monster that will destroy the capital in 10 years.