The Middle-aged Deliveryman Becomes an Invincible Swordsman as a Side JobUnsouya no Ossan ga Nazeka Fukugyou de Zettai Muteki Kenshi wo Tsutomeru Koto ni ~Saenai Jinsei wo Okutteta Ore ga Maou Toubatsu no Kirifuda ni?~; 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？～; The Middle-Aged Delivery Man Who for Some Reason Ends Up Working as an Invincible Swordsman on the Side: Will I, Who Has Led a Boring Life, Become the Trump Card To Defeat the Demon King?