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? ; The Middle-Aged Deliveryman Becomes an Invincible Swordsman as a Side Job ; The Middle-Aged Deliveryman Becomes an Invincible Swordsman as a Side Job ~ After Leading a Lousy Life ; I’m Now the Trump Card to Defeat the Demon King? ; 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?~