They may have money and time, but Kokoro and bodies are not satisfied with just that. Seeking some fresh air in their boring daily lives, four women decide to go on a trip to a hot spring. As their bodies, heated after a soak in the hot springs, are carefully massaged with oil, hot springs begin to gush forth from their sensitive parts. Unable to contain their arousal, they end up sneaking into the masseuse's room and sneaking into his room. There's no time to let the bath cool down!