"Yuri," the good-for-nothing third prince of the Kingdom of Briol, is the only survivor when the kingdom falls in its final hour—escaping alone with nothing but his life. Wandering in torment, consumed by guilt and regret, Yuri eventually meets his end... ...Only to open his eyes and see a familiar face— his father's. At first, he believes they've descended into hell together. "Father... so you ended up in hell, after all." "What?" "Well, I suppose it makes sense. For someone who always preached about honor, you sure lived a decadent life..." "What nonsense are you spouting?!" But this isn't hell. He's returned to the spring of his 13th year. One lifetime of bitter regret was enough. This time, Yuri will not let his kingdom fall.