Isekai kara no Kigyou Shinshutsu?! Moto Shachiku ga Isekai Tenshoku shite Nariagaru! Yuusha ga Kouryaku Dekinai Meikyuu wo Tsukuriagero

Former black company employee, Jirou Tanaka leaves his job due to overwork. In his home, he founds a job recruitment template which is from another world company. The job is to test the dungeon created by the demon king. There, the days of diving into the dungeon as a "dungeon tester" were waiting for him to complete the dungeon that even the hero would not be able to clear. He has a hot dark elf boss who has an amazing ability "Magic resistance." The new life of our main character starts!

(Source: Kodansha, translated)