Makoto, a weary 38-year-old single man, thought his life ended when he was attacked by thugs in a park late at night. But when he opens his eyes, he finds himself inside a dungeon in another world! Not only has his body reverted to its younger days, he has also awakened as a powerful spirit mage capable of wielding black flames. Seeing this as a chance to escape his miserable life in Japan, Makoto decides to start over. He soon teams up with Yuuka, a sharp-tongued, tsundere high school girl wearing a witch’s hat and burdened with secrets of her own. The unlikely duo forms a partnership with one goal in mind: a peaceful slow life. To get there, they’ll have to defeat monsters, take on quests, and survive the dangers of the dungeon—starting with escaping it alive! “Your job is to protect me from monsters. Easy, right?” “What do you expect from a guy who’s almost forty?!” A bickering yet perfectly matched pair—a former middle-aged man and a high school girl—set their sights on becoming the strongest, all for the sake of a laid-back new life. A life-restart isekai fantasy begins!