Jun lives an ordinary married life but feels herself drifting farther from her husband every day. First the foreplay disappeared, then the words “I love you,” and eventually even sex and kissing were gone. One day, her husband invites his former classmate Yosuke to dinner. Yosuke once confessed his feelings to Jun during their school days. As the drinks flow, her husband steps into the bathroom—and Yosuke suddenly steals a kiss that floods her with electrifying guilt.