After 13 years of silence in a full-scale drama, Itoya Mei makes a full comeback! Mei has been married for 10 years, and although she and her husband are alone, they are a happy couple with no fights. Her husband is fond of Yuta, a junior colleague at work. One day, Yuta confesses his feelings to her, and she turns him down. Instead of giving up, she grants his wish, "I want to kiss you just once." This awakens the woman who had been sleeping inside her. And then... one day, Yuta shows up at her house when her husband is out, and they share another passionate kiss...