運送屋のおっさんがなぜか副業で絶対無敵剣士を務めることに～さえない人生を送ってた俺が魔王討伐の切り札に？～

運送屋のおっさんがなぜか副業で絶対無敵剣士を務めることに～さえない人生を送ってた俺が魔王討伐の切り札に？～, For Some Reason, a Middle-Aged Man from a Freight Company Ends Up Working as an Invincible Swordsman as a Side Job I Was Living a Boring Life, but Now I’m the Trump Card to Defeat the Demon King?, Unsou’ya no Ossan ga Naze ka Fukugyou de Zettai Muteki Kenshi wo Tsutomeru Koto ni Sae Nai Jinsei wo Okutteta Ore ga Maou Toubatsu no Kirifuda ni?, Unsou’ya No Ossan Ga Naze Ka Fukugyou De Zettai Muteki Kenshi O Tsutomeru Koto Ni: Sae Nai Jinsei O Okutteta Ore