Takazaki Ryu is one of a human who has successfully achieved the 4th tier, the so-called God Tier. To be specific, He's the first man to take the alias of Ares, the God of War.
He also successfully reach the top of Babel tower, the core of all dungeons by going solo. This is all for him to take revenge for the death of his family, friends, and most importantly, lover.
Although, when he's finally able to confront the one who's held responsible for the Dungeon creation, he simply gets played around and utterly destroyed without even able to land a hit on her.
Prepared to die, his nemesis suddenly announced that she will give him a second chance before sending him back to when he's still 14 years old. What's actually her motivation behind those actions?