A 34-year-old NEET otaku is chased out of his house by his family. This plump, unattractive, and penniless nice-guy virgin finds his life quickly going downhill. In a moment of clarity, he realizes that his life could've unfolded better if he'd been able to get over his past trauma. As he begins to regret his past, he spots three high-school students directly in the path of a runaway truck. Not wanting to be left with further regret, he musters his strength to try and rescue them. Predictably, he loses his own life in the process. When next he opens his eyes, he finds himself reincarnated into a world of swords and magic, as a young Rudeus Greyrat. Born into a new world, with a new lease on life, Rudeus resolves that this time, he'll do what he couldn't; 'To live on seriously,' leaving no regrets. Thus starts the journey of a broken man who yearned to start his life anew.