watercolor illustration, kitten smiling with an open mouth and with a towel over the head and enjoying a hot spring, surrounded by gentle steam rising from the onsen water, feeling the pleasant sensation. Small bubbles dance through its fur, creating a mysterious yet beautiful sight. The cat stretches out, gradually unwinding, as the warmth of the onsen melts away the tension in its muscles. It gracefully savors the serene atmosphere and the gentle touch of nature, embracing the tranquility of t