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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 she had nothing to do with her, the offer of "exchange life" from her neighbor was just overwhelming. - If her husband was good, it was a muddy love with her ... and the reply on the spot, but her husband's reply started an exchange life with a mixture of'YES'expectations and anxieties.