Shonobu was asked to deliver a neighborhood notice to the neighboring Oda household, but the prolonged cold weather had left his body sluggish and drained of energy. His neighbor's wife, Reiko, offered him warm mochi, which slightly lifted his spirits. However, he accidentally choked on the mochi and collapsed. When he regained consciousness, he found himself under Reiko's kotatsu. Wrapped in a dreamlike warmth, Shonobu began to doze off again—only to realize that Reiko, wearing no panties, was now inside the kotatsu with him.