FOR SOME REASON, THE OLD MAN WHO IS A CARRIER, HAS BEEN WORKING AS AN INVINCIBLE SWORDSMAN ON HIS SIDE JOB. I'VE LED A LIFE WITHOUT EVEN KNOWING THAT I'M THE TRUMP CARD TO ATTACK THE DEMON KING? ～ (1) / Koichiro Hoshino

Product description ※Please note that product information is not in full comprehensive meaning because of the machine translation.

Old Man Jack, a humble carrier, is suddenly called by the King's Capital in his everyday mundane life. There he was waiting for Lieseletto, who had once carried to the King's Capital as a carrier. When she grew up to be the Commander of the Order, she told Jack that she had been recommended for the title "Isai-Tenken," which is given to the true greatest swordsman! Here is the story of the unacknowledged greatest hero by an old man who has no power!