Ten years into our marriage, my feelings for Maki remain unchanged. Yet, amid our mundane daily life, my abnormal desires have grown stronger each day. The urge to have another man take my wife—my cuckold fetish—constantly haunts me. Struggling to suppress these feelings, I eventually spent six months convincing her, and today I've finally made the decision to let a man, recruited from a cuckold message board, have sex with Maki. To prevent the possibility of my wife falling for him, I've set five strict rules. But one by one, without my realizing it, those rules begin to be broken...