Bajo el mismo cielo

In the sprawling, divided metropolis of Kurogawa, the glittering lights of the central districts never shine on the forgotten slums of Sector 7. Seventeen-year-old Ren Kurogane is a calculating youth who prefers observation over violence. But when his closest friend is abducted into the brutal underground fighting circuits, Ren must step into the blood-stained ring himself. Armed with an analytical mind that reads opponents' muscle movements like code, Ren adapts to survive, his lean frame slowly forging into a weapon. His cold worldview begins to shift when he crosses paths with Yumi Sakamoto, a fierce fighter who challenges his cynical nature. As Ren climbs the ranks, he uncovers a web of family secrets, corporate greed, and lethal rivalries. To survive the violent depths of Sector 7 and protect those he loves, Ren must push past his physical limits and discover what it truly means to be strong under the same uncaring sky.