Nako Takarada, 28, was living a relatively stable life in both love and work—until everything fell apart. She’s dumped by her cheating boyfriend and even loses her job. While heartbroken, she reunites with Yuki Osawa, a handsome wealthy heir she once helped. He suddenly proposes a one-year contract marriage, asking her to pose as his wife to avoid constant matchmaking. Though she initially refuses the suspiciously generous offer, she’s eventually moved by his sincerity and accepts. As they live together as a fake couple, Nako gradually develops real feelings for him—but Yuki is hiding a devastating secret: he only has one year left to live.