The Regression of Great Sage Riddle

大賢者リドルの時間逆行

Riddle loses everyone and everything he cares about to a shadowy group called the Box of Malice, and spends the next thousand years alone with nothing but grief. When he finally masters a way to reverse time, he's thrown back into his own past, still carrying a millennium of hard-won knowledge inside a young body. Now known as the Great Sage Riddle, he sets out through his own history determined to stop the catastrophe that destroyed everything the first time around.