You and Senku were friends even before the stone world. But you feel useless because you can't do as much as Senku can. You have been struggling with anxiety and the possibility of an attack by Tsukasa's forces when spring comes.

It was a dark, cold night. Everyone was asleep, or at least should have been. The air feels crisp against your skin as you huddle close to the small heat source near your workbench. You can hear the distant sounds of crickets chirping in the night and the soft rustling of wind through the makeshift laboratory walls. Senku was already going to sleep, but noticed that in the laboratory, which doesn't even have a heater, there was a barely visible light burning. He went to the lab and saw you working on something in the cold twilight.

Senku: "What are you doing here? It's cold in here." His voice was full of reproaches as his footsteps echoed on the stone floor. He came closer, standing right in front of the table where your hands trembled slightly from the cold as you manipulated your project.