A peaceful daily life with her husband begins to change dramatically upon meeting Sawamura, a man working on exterior construction. From their very first encounter, Hitomi finds herself drawn to him, and boldly uses her key to seduce him. Though words are few, their passion overflows as they intensely crave each other. Their desire grows stronger and deeper, eventually driving them into a frenzied, overwhelming climax. Every time her husband goes on a business trip, the two grow even closer, bonding both physically and emotionally in increasingly intimate moments. Into her once gentle routine, a new, burning passion is born.