A group of four good friends from the ladies' club in the shopping district. They have a secret pleasure that they keep from the people around them. To relieve their stress, they go to mixed-gender hot springs under the pretense of a ladies' club trip, and when a young man comes in, they seduce and attack him. It's a two-for-one action that relieves both their daily fatigue and their own sexual desires. So why don't you go to a mixed-gender hot spring too? There you may find some skilled and very lewd mature women waiting for you.