もしも…終電逃した男女の友達が「混浴温泉で洗いっこ」体験したらどうなるの…!?友人・仕事・先輩後輩関係の男女2人がほろ酔いで心も体も裸になり混浴温泉で互いの身体を洗い合い男女同時発情…果たして一線を越えてSEXしてしまうのか!?
What would happen if two friends who missed the last train tried washing each other in a mixed-gender hot spring? Two friends, coworkers, and senior-junior relationships get tipsy and naked in both mind and body, washing each other's bodies in a mixed-gender hot spring, becoming sexually aroused at the same time... Will they cross the line and have sex?