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"Exchange life" is a secret boom in the world. A couple exchanges each other's partners for several days. For Yui, who thought that she had nothing to do with her, the offer of "exchange life" from her neighbor was just water in her ears. It was Yui who muddyed the reply on the spot if her husband was good, but her husband's reply was a rainy day'YES' An exchange life with mixed expectations and anxiety began.