Eric lost everything.

His family, childhood friend, best friend, and—his beloved.

Despairing after losing everything, Eric believed there was no meaning left in life and committed suicide—

However, despite having died, he awoke, and upon grasping his situation, realized he had become a baby!?

He thought it was reincarnation, but he didn't understand why he retained memories of his past life.

However, having been born with these memories of his past life, Eric, who was already in despair, came to resent the fate of reincarnation.

And when he looked at his mother—she was the very same mother from his previous life.

Eric understood that he hadn't merely 'become' a baby; he had 'returned' to being one. He resolved to grow stronger, to become the absolute strongest, in order to save everything he had lost—

—This is the story of a man who confronts the uncertain nature of fate.