The Heartless Lord: Lost His Heart at the Beginning

The city of silver armor, above the wasteland. Orion Kepler woke up from the wreckage of the spacecraft and found a big hole in his chest. His heart was nowhere to be found and his body temperature continued to drop. Others would have died ten thousand times, but Orion touched his empty chest: "Although there is air leakage, the view is wide and it is not a big problem."