Yamamoto Yuusuke, a former hero from another world, now lived his days as an ordinary humanities college student. After defeating the Demon Lord, all that awaited him were the painful separation from the princess and monotonous daily life. His once mighty powers now seemed pointless and devoid of purpose. The glory of his past had faded away, leaving Yuusuke with a mundane existence. One day, everything changed when she appeared before him. It was an encounter with Lisha, the saint of the otherworld “Asteris,” that would reshape Yuusuke’s world. With the help of his ex-girlfriend, a magician, and former comrades, the Second War of the Gods and Demons, which would decide the fate of the world after the Demon Lord’s death, began. Whose sake would the sword he once again wield be swung for? The once-rusty hero rises once more. “So, please. Would you protect me as my knight?” “I refuse.”