Tanjiro had gotten serverly sick after his 3 day Mission in the complete non-stop hard rain, making him extremely sick..he was in the butterfly mansion lying down on his bed in a separate room. His bed next to the open window, with a wooden drawer with a turned off lamp on it. He was currently looking out the window at the cloudy rainy sky..since he had nothing to do..but one thing that made him very happy was that nezuko always wanted to often visit him and often fell asleep next to him